783 lines
18 KiB
ArmAsm
783 lines
18 KiB
ArmAsm
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/* $Id: head.S,v 1.87 2002/02/09 19:49:31 davem Exp $
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* head.S: Initial boot code for the Sparc64 port of Linux.
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*
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* Copyright (C) 1996,1997 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996 David Sitsky (David.Sitsky@anu.edu.au)
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 Miguel de Icaza (miguel@nuclecu.unam.mx)
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*/
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#include <linux/config.h>
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#include <linux/version.h>
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#include <linux/errno.h>
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#include <asm/thread_info.h>
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#include <asm/asi.h>
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#include <asm/pstate.h>
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#include <asm/ptrace.h>
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#include <asm/spitfire.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/errno.h>
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#include <asm/signal.h>
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#include <asm/processor.h>
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#include <asm/lsu.h>
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#include <asm/dcr.h>
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#include <asm/dcu.h>
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#include <asm/head.h>
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#include <asm/ttable.h>
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#include <asm/mmu.h>
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/* This section from from _start to sparc64_boot_end should fit into
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* 0x0000.0000.0040.4000 to 0x0000.0000.0040.8000 and will be sharing space
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* with bootup_user_stack, which is from 0x0000.0000.0040.4000 to
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* 0x0000.0000.0040.6000 and empty_bad_page, which is from
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* 0x0000.0000.0040.6000 to 0x0000.0000.0040.8000.
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*/
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.text
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.globl start, _start, stext, _stext
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_start:
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start:
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_stext:
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stext:
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bootup_user_stack:
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! 0x0000000000404000
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b sparc64_boot
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flushw /* Flush register file. */
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/* This stuff has to be in sync with SILO and other potential boot loaders
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* Fields should be kept upward compatible and whenever any change is made,
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* HdrS version should be incremented.
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*/
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.global root_flags, ram_flags, root_dev
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.global sparc_ramdisk_image, sparc_ramdisk_size
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.global sparc_ramdisk_image64
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.ascii "HdrS"
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.word LINUX_VERSION_CODE
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/* History:
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*
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* 0x0300 : Supports being located at other than 0x4000
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* 0x0202 : Supports kernel params string
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* 0x0201 : Supports reboot_command
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*/
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.half 0x0301 /* HdrS version */
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root_flags:
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.half 1
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root_dev:
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.half 0
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ram_flags:
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.half 0
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sparc_ramdisk_image:
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.word 0
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sparc_ramdisk_size:
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.word 0
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.xword reboot_command
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.xword bootstr_info
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sparc_ramdisk_image64:
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.xword 0
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.word _end
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/* We must be careful, 32-bit OpenBOOT will get confused if it
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* tries to save away a register window to a 64-bit kernel
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* stack address. Flush all windows, disable interrupts,
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* remap if necessary, jump onto kernel trap table, then kernel
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* stack, or else we die.
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*
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* PROM entry point is on %o4
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*/
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sparc64_boot:
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BRANCH_IF_CHEETAH_BASE(g1,g7,cheetah_boot)
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BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,cheetah_plus_boot)
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ba,pt %xcc, spitfire_boot
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nop
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cheetah_plus_boot:
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/* Preserve OBP chosen DCU and DCR register settings. */
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ba,pt %xcc, cheetah_generic_boot
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nop
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cheetah_boot:
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mov DCR_BPE | DCR_RPE | DCR_SI | DCR_IFPOE | DCR_MS, %g1
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wr %g1, %asr18
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sethi %uhi(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
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or %g7, %ulo(DCU_ME|DCU_RE|DCU_HPE|DCU_SPE|DCU_SL|DCU_WE), %g7
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sllx %g7, 32, %g7
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or %g7, DCU_DM | DCU_IM | DCU_DC | DCU_IC, %g7
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stxa %g7, [%g0] ASI_DCU_CONTROL_REG
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membar #Sync
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cheetah_generic_boot:
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mov TSB_EXTENSION_P, %g3
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stxa %g0, [%g3] ASI_DMMU
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stxa %g0, [%g3] ASI_IMMU
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membar #Sync
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mov TSB_EXTENSION_S, %g3
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stxa %g0, [%g3] ASI_DMMU
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membar #Sync
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mov TSB_EXTENSION_N, %g3
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stxa %g0, [%g3] ASI_DMMU
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stxa %g0, [%g3] ASI_IMMU
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membar #Sync
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wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
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wr %g0, 0, %fprs
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/* Just like for Spitfire, we probe itlb-2 for a mapping which
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* matches our current %pc. We take the physical address in
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* that mapping and use it to make our own.
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*/
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/* %g5 holds the tlb data */
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sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5
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sllx %g5, 32, %g5
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or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5
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/* Put PADDR tlb data mask into %g3. */
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sethi %uhi(_PAGE_PADDR), %g3
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or %g3, %ulo(_PAGE_PADDR), %g3
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sllx %g3, 32, %g3
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sethi %hi(_PAGE_PADDR), %g7
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or %g7, %lo(_PAGE_PADDR), %g7
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or %g3, %g7, %g3
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set 2 << 16, %l0 /* TLB entry walker. */
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set 0x1fff, %l2 /* Page mask. */
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rd %pc, %l3
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andn %l3, %l2, %g2 /* vaddr comparator */
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1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
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membar #Sync
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andn %g1, %l2, %g1
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cmp %g1, %g2
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be,pn %xcc, cheetah_got_tlbentry
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nop
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and %l0, (127 << 3), %g1
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cmp %g1, (127 << 3)
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blu,pt %xcc, 1b
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add %l0, (1 << 3), %l0
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/* Search the small TLB. OBP never maps us like that but
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* newer SILO can.
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*/
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clr %l0
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1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
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membar #Sync
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andn %g1, %l2, %g1
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cmp %g1, %g2
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be,pn %xcc, cheetah_got_tlbentry
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nop
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cmp %l0, (15 << 3)
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blu,pt %xcc, 1b
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add %l0, (1 << 3), %l0
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/* BUG() if we get here... */
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ta 0x5
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cheetah_got_tlbentry:
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ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g0
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ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1
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membar #Sync
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and %g1, %g3, %g1
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set 0x5fff, %l0
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andn %g1, %l0, %g1
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or %g5, %g1, %g5
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/* Clear out any KERNBASE area entries. */
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set 2 << 16, %l0
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sethi %hi(KERNBASE), %g3
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sethi %hi(KERNBASE<<1), %g7
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mov TLB_TAG_ACCESS, %l7
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/* First, check ITLB */
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1: ldxa [%l0] ASI_ITLB_TAG_READ, %g1
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membar #Sync
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andn %g1, %l2, %g1
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cmp %g1, %g3
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blu,pn %xcc, 2f
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cmp %g1, %g7
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bgeu,pn %xcc, 2f
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nop
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stxa %g0, [%l7] ASI_IMMU
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membar #Sync
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stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS
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membar #Sync
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2: and %l0, (127 << 3), %g1
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cmp %g1, (127 << 3)
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blu,pt %xcc, 1b
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add %l0, (1 << 3), %l0
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/* Next, check DTLB */
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set 2 << 16, %l0
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1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1
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membar #Sync
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andn %g1, %l2, %g1
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cmp %g1, %g3
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blu,pn %xcc, 2f
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cmp %g1, %g7
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bgeu,pn %xcc, 2f
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nop
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stxa %g0, [%l7] ASI_DMMU
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membar #Sync
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stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
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membar #Sync
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2: and %l0, (511 << 3), %g1
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cmp %g1, (511 << 3)
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blu,pt %xcc, 1b
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add %l0, (1 << 3), %l0
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/* On Cheetah+, have to check second DTLB. */
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BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,l0,2f)
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ba,pt %xcc, 9f
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nop
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2: set 3 << 16, %l0
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1: ldxa [%l0] ASI_DTLB_TAG_READ, %g1
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membar #Sync
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andn %g1, %l2, %g1
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cmp %g1, %g3
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blu,pn %xcc, 2f
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cmp %g1, %g7
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bgeu,pn %xcc, 2f
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nop
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stxa %g0, [%l7] ASI_DMMU
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membar #Sync
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stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
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membar #Sync
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2: and %l0, (511 << 3), %g1
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cmp %g1, (511 << 3)
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blu,pt %xcc, 1b
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add %l0, (1 << 3), %l0
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9:
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/* Now lock the TTE we created into ITLB-0 and DTLB-0,
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* entry 15 (and maybe 14 too).
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*/
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sethi %hi(KERNBASE), %g3
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set (0 << 16) | (15 << 3), %g7
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stxa %g3, [%l7] ASI_DMMU
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membar #Sync
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stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
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membar #Sync
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stxa %g3, [%l7] ASI_IMMU
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membar #Sync
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stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
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membar #Sync
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flush %g3
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membar #Sync
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sethi %hi(_end), %g3 /* Check for bigkernel case */
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or %g3, %lo(_end), %g3
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srl %g3, 23, %g3 /* Check if _end > 8M */
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brz,pt %g3, 1f
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sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
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sethi %hi(0x400000), %g3
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or %g3, %lo(0x400000), %g3
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add %g5, %g3, %g5 /* New tte data */
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andn %g5, (_PAGE_G), %g5
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sethi %hi(KERNBASE+0x400000), %g3
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or %g3, %lo(KERNBASE+0x400000), %g3
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set (0 << 16) | (14 << 3), %g7
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stxa %g3, [%l7] ASI_DMMU
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membar #Sync
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stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
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membar #Sync
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stxa %g3, [%l7] ASI_IMMU
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membar #Sync
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stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
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membar #Sync
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flush %g3
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membar #Sync
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sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
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ba,pt %xcc, 1f
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nop
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1: set sun4u_init, %g2
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jmpl %g2 + %g0, %g0
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nop
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spitfire_boot:
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/* Typically PROM has already enabled both MMU's and both on-chip
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* caches, but we do it here anyway just to be paranoid.
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*/
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mov (LSU_CONTROL_IC|LSU_CONTROL_DC|LSU_CONTROL_IM|LSU_CONTROL_DM), %g1
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stxa %g1, [%g0] ASI_LSU_CONTROL
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membar #Sync
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/*
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* Make sure we are in privileged mode, have address masking,
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* using the ordinary globals and have enabled floating
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* point.
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*
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* Again, typically PROM has left %pil at 13 or similar, and
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* (PSTATE_PRIV | PSTATE_PEF | PSTATE_IE) in %pstate.
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*/
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wrpr %g0, (PSTATE_PRIV|PSTATE_PEF|PSTATE_IE), %pstate
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wr %g0, 0, %fprs
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spitfire_create_mappings:
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/* %g5 holds the tlb data */
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sethi %uhi(_PAGE_VALID | _PAGE_SZ4MB), %g5
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sllx %g5, 32, %g5
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or %g5, (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_L | _PAGE_W | _PAGE_G), %g5
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/* Base of physical memory cannot reliably be assumed to be
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* at 0x0! Figure out where it happens to be. -DaveM
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*/
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/* Put PADDR tlb data mask into %g3. */
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sethi %uhi(_PAGE_PADDR_SF), %g3
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or %g3, %ulo(_PAGE_PADDR_SF), %g3
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sllx %g3, 32, %g3
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|
sethi %hi(_PAGE_PADDR_SF), %g7
|
||
|
|
or %g7, %lo(_PAGE_PADDR_SF), %g7
|
||
|
|
or %g3, %g7, %g3
|
||
|
|
|
||
|
|
/* Walk through entire ITLB, looking for entry which maps
|
||
|
|
* our %pc currently, stick PADDR from there into %g5 tlb data.
|
||
|
|
*/
|
||
|
|
clr %l0 /* TLB entry walker. */
|
||
|
|
set 0x1fff, %l2 /* Page mask. */
|
||
|
|
rd %pc, %l3
|
||
|
|
andn %l3, %l2, %g2 /* vaddr comparator */
|
||
|
|
1:
|
||
|
|
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
|
||
|
|
ldxa [%l0] ASI_ITLB_TAG_READ, %g1
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
andn %g1, %l2, %g1 /* Get vaddr */
|
||
|
|
cmp %g1, %g2
|
||
|
|
be,a,pn %xcc, spitfire_got_tlbentry
|
||
|
|
ldxa [%l0] ASI_ITLB_DATA_ACCESS, %g1
|
||
|
|
cmp %l0, (63 << 3)
|
||
|
|
blu,pt %xcc, 1b
|
||
|
|
add %l0, (1 << 3), %l0
|
||
|
|
|
||
|
|
/* BUG() if we get here... */
|
||
|
|
ta 0x5
|
||
|
|
|
||
|
|
spitfire_got_tlbentry:
|
||
|
|
/* Nops here again, perhaps Cheetah/Blackbird are better behaved... */
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
and %g1, %g3, %g1 /* Mask to just get paddr bits. */
|
||
|
|
set 0x5fff, %l3 /* Mask offset to get phys base. */
|
||
|
|
andn %g1, %l3, %g1
|
||
|
|
|
||
|
|
/* NOTE: We hold on to %g1 paddr base as we need it below to lock
|
||
|
|
* NOTE: the PROM cif code into the TLB.
|
||
|
|
*/
|
||
|
|
|
||
|
|
or %g5, %g1, %g5 /* Or it into TAG being built. */
|
||
|
|
|
||
|
|
clr %l0 /* TLB entry walker. */
|
||
|
|
sethi %hi(KERNBASE), %g3 /* 4M lower limit */
|
||
|
|
sethi %hi(KERNBASE<<1), %g7 /* 8M upper limit */
|
||
|
|
mov TLB_TAG_ACCESS, %l7
|
||
|
|
1:
|
||
|
|
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
|
||
|
|
ldxa [%l0] ASI_ITLB_TAG_READ, %g1
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
andn %g1, %l2, %g1 /* Get vaddr */
|
||
|
|
cmp %g1, %g3
|
||
|
|
blu,pn %xcc, 2f
|
||
|
|
cmp %g1, %g7
|
||
|
|
bgeu,pn %xcc, 2f
|
||
|
|
nop
|
||
|
|
stxa %g0, [%l7] ASI_IMMU
|
||
|
|
stxa %g0, [%l0] ASI_ITLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
2:
|
||
|
|
cmp %l0, (63 << 3)
|
||
|
|
blu,pt %xcc, 1b
|
||
|
|
add %l0, (1 << 3), %l0
|
||
|
|
|
||
|
|
nop; nop; nop
|
||
|
|
|
||
|
|
clr %l0 /* TLB entry walker. */
|
||
|
|
1:
|
||
|
|
/* Yes, the nops seem to be necessary for now, don't ask me why. -DaveM */
|
||
|
|
ldxa [%l0] ASI_DTLB_TAG_READ, %g1
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
nop
|
||
|
|
andn %g1, %l2, %g1 /* Get vaddr */
|
||
|
|
cmp %g1, %g3
|
||
|
|
blu,pn %xcc, 2f
|
||
|
|
cmp %g1, %g7
|
||
|
|
bgeu,pn %xcc, 2f
|
||
|
|
nop
|
||
|
|
stxa %g0, [%l7] ASI_DMMU
|
||
|
|
stxa %g0, [%l0] ASI_DTLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
2:
|
||
|
|
cmp %l0, (63 << 3)
|
||
|
|
blu,pt %xcc, 1b
|
||
|
|
add %l0, (1 << 3), %l0
|
||
|
|
|
||
|
|
nop; nop; nop
|
||
|
|
|
||
|
|
|
||
|
|
/* PROM never puts any TLB entries into the MMU with the lock bit
|
||
|
|
* set. So we gladly use tlb entry 63 for KERNBASE. And maybe 62 too.
|
||
|
|
*/
|
||
|
|
|
||
|
|
sethi %hi(KERNBASE), %g3
|
||
|
|
mov (63 << 3), %g7
|
||
|
|
stxa %g3, [%l7] ASI_DMMU /* KERNBASE into TLB TAG */
|
||
|
|
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS /* TTE into TLB DATA */
|
||
|
|
membar #Sync
|
||
|
|
stxa %g3, [%l7] ASI_IMMU /* KERNBASE into TLB TAG */
|
||
|
|
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS /* TTE into TLB DATA */
|
||
|
|
membar #Sync
|
||
|
|
flush %g3
|
||
|
|
membar #Sync
|
||
|
|
sethi %hi(_end), %g3 /* Check for bigkernel case */
|
||
|
|
or %g3, %lo(_end), %g3
|
||
|
|
srl %g3, 23, %g3 /* Check if _end > 8M */
|
||
|
|
brz,pt %g3, 2f
|
||
|
|
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
|
||
|
|
sethi %hi(0x400000), %g3
|
||
|
|
or %g3, %lo(0x400000), %g3
|
||
|
|
add %g5, %g3, %g5 /* New tte data */
|
||
|
|
andn %g5, (_PAGE_G), %g5
|
||
|
|
sethi %hi(KERNBASE+0x400000), %g3
|
||
|
|
or %g3, %lo(KERNBASE+0x400000), %g3
|
||
|
|
mov (62 << 3), %g7
|
||
|
|
stxa %g3, [%l7] ASI_DMMU
|
||
|
|
stxa %g5, [%g7] ASI_DTLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
stxa %g3, [%l7] ASI_IMMU
|
||
|
|
stxa %g5, [%g7] ASI_ITLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
flush %g3
|
||
|
|
membar #Sync
|
||
|
|
sethi %hi(KERNBASE), %g3 /* Restore for fixup code below */
|
||
|
|
2: ba,pt %xcc, 1f
|
||
|
|
nop
|
||
|
|
1:
|
||
|
|
set sun4u_init, %g2
|
||
|
|
jmpl %g2 + %g0, %g0
|
||
|
|
nop
|
||
|
|
|
||
|
|
sun4u_init:
|
||
|
|
/* Set ctx 0 */
|
||
|
|
mov PRIMARY_CONTEXT, %g7
|
||
|
|
stxa %g0, [%g7] ASI_DMMU
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
mov SECONDARY_CONTEXT, %g7
|
||
|
|
stxa %g0, [%g7] ASI_DMMU
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
/* We are now safely (we hope) in Nucleus context (0), rewrite
|
||
|
|
* the KERNBASE TTE's so they no longer have the global bit set.
|
||
|
|
* Don't forget to setup TAG_ACCESS first 8-)
|
||
|
|
*/
|
||
|
|
mov TLB_TAG_ACCESS, %g2
|
||
|
|
stxa %g3, [%g2] ASI_IMMU
|
||
|
|
stxa %g3, [%g2] ASI_DMMU
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
BRANCH_IF_ANY_CHEETAH(g1,g7,cheetah_tlb_fixup)
|
||
|
|
|
||
|
|
ba,pt %xcc, spitfire_tlb_fixup
|
||
|
|
nop
|
||
|
|
|
||
|
|
cheetah_tlb_fixup:
|
||
|
|
set (0 << 16) | (15 << 3), %g7
|
||
|
|
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g0
|
||
|
|
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1
|
||
|
|
andn %g1, (_PAGE_G), %g1
|
||
|
|
stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g0
|
||
|
|
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1
|
||
|
|
andn %g1, (_PAGE_G), %g1
|
||
|
|
stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
/* Kill instruction prefetch queues. */
|
||
|
|
flush %g3
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
mov 2, %g2 /* Set TLB type to cheetah+. */
|
||
|
|
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
|
||
|
|
|
||
|
|
mov 1, %g2 /* Set TLB type to cheetah. */
|
||
|
|
|
||
|
|
1: sethi %hi(tlb_type), %g1
|
||
|
|
stw %g2, [%g1 + %lo(tlb_type)]
|
||
|
|
|
||
|
|
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g1,g7,1f)
|
||
|
|
ba,pt %xcc, 2f
|
||
|
|
nop
|
||
|
|
|
||
|
|
1: /* Patch context register writes to support nucleus page
|
||
|
|
* size correctly.
|
||
|
|
*/
|
||
|
|
call cheetah_plus_patch_etrap
|
||
|
|
nop
|
||
|
|
call cheetah_plus_patch_rtrap
|
||
|
|
nop
|
||
|
|
call cheetah_plus_patch_fpdis
|
||
|
|
nop
|
||
|
|
call cheetah_plus_patch_winfixup
|
||
|
|
nop
|
||
|
|
|
||
|
|
|
||
|
|
2: /* Patch copy/page operations to cheetah optimized versions. */
|
||
|
|
call cheetah_patch_copyops
|
||
|
|
nop
|
||
|
|
call cheetah_patch_cachetlbops
|
||
|
|
nop
|
||
|
|
|
||
|
|
ba,pt %xcc, tlb_fixup_done
|
||
|
|
nop
|
||
|
|
|
||
|
|
spitfire_tlb_fixup:
|
||
|
|
mov (63 << 3), %g7
|
||
|
|
ldxa [%g7] ASI_ITLB_DATA_ACCESS, %g1
|
||
|
|
andn %g1, (_PAGE_G), %g1
|
||
|
|
stxa %g1, [%g7] ASI_ITLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
ldxa [%g7] ASI_DTLB_DATA_ACCESS, %g1
|
||
|
|
andn %g1, (_PAGE_G), %g1
|
||
|
|
stxa %g1, [%g7] ASI_DTLB_DATA_ACCESS
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
/* Kill instruction prefetch queues. */
|
||
|
|
flush %g3
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
/* Set TLB type to spitfire. */
|
||
|
|
mov 0, %g2
|
||
|
|
sethi %hi(tlb_type), %g1
|
||
|
|
stw %g2, [%g1 + %lo(tlb_type)]
|
||
|
|
|
||
|
|
tlb_fixup_done:
|
||
|
|
sethi %hi(init_thread_union), %g6
|
||
|
|
or %g6, %lo(init_thread_union), %g6
|
||
|
|
ldx [%g6 + TI_TASK], %g4
|
||
|
|
mov %sp, %l6
|
||
|
|
mov %o4, %l7
|
||
|
|
|
||
|
|
#if 0 /* We don't do it like this anymore, but for historical hack value
|
||
|
|
* I leave this snippet here to show how crazy we can be sometimes. 8-)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Setup "Linux Current Register", thanks Sun 8-) */
|
||
|
|
wr %g0, 0x1, %pcr
|
||
|
|
|
||
|
|
/* Blackbird errata workaround. See commentary in
|
||
|
|
* smp.c:smp_percpu_timer_interrupt() for more
|
||
|
|
* information.
|
||
|
|
*/
|
||
|
|
ba,pt %xcc, 99f
|
||
|
|
nop
|
||
|
|
.align 64
|
||
|
|
99: wr %g6, %g0, %pic
|
||
|
|
rd %pic, %g0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
wr %g0, ASI_P, %asi
|
||
|
|
mov 1, %g1
|
||
|
|
sllx %g1, THREAD_SHIFT, %g1
|
||
|
|
sub %g1, (STACKFRAME_SZ + STACK_BIAS), %g1
|
||
|
|
add %g6, %g1, %sp
|
||
|
|
mov 0, %fp
|
||
|
|
|
||
|
|
/* Set per-cpu pointer initially to zero, this makes
|
||
|
|
* the boot-cpu use the in-kernel-image per-cpu areas
|
||
|
|
* before setup_per_cpu_area() is invoked.
|
||
|
|
*/
|
||
|
|
clr %g5
|
||
|
|
|
||
|
|
wrpr %g0, 0, %wstate
|
||
|
|
wrpr %g0, 0x0, %tl
|
||
|
|
|
||
|
|
/* Clear the bss */
|
||
|
|
sethi %hi(__bss_start), %o0
|
||
|
|
or %o0, %lo(__bss_start), %o0
|
||
|
|
sethi %hi(_end), %o1
|
||
|
|
or %o1, %lo(_end), %o1
|
||
|
|
call __bzero
|
||
|
|
sub %o1, %o0, %o1
|
||
|
|
|
||
|
|
mov %l6, %o1 ! OpenPROM stack
|
||
|
|
call prom_init
|
||
|
|
mov %l7, %o0 ! OpenPROM cif handler
|
||
|
|
|
||
|
|
/* Off we go.... */
|
||
|
|
call start_kernel
|
||
|
|
nop
|
||
|
|
/* Not reached... */
|
||
|
|
|
||
|
|
/* IMPORTANT NOTE: Whenever making changes here, check
|
||
|
|
* trampoline.S as well. -jj */
|
||
|
|
.globl setup_tba
|
||
|
|
setup_tba: /* i0 = is_starfire */
|
||
|
|
save %sp, -160, %sp
|
||
|
|
|
||
|
|
rdpr %tba, %g7
|
||
|
|
sethi %hi(prom_tba), %o1
|
||
|
|
or %o1, %lo(prom_tba), %o1
|
||
|
|
stx %g7, [%o1]
|
||
|
|
|
||
|
|
/* Setup "Linux" globals 8-) */
|
||
|
|
rdpr %pstate, %o1
|
||
|
|
mov %g6, %o2
|
||
|
|
wrpr %o1, (PSTATE_AG|PSTATE_IE), %pstate
|
||
|
|
sethi %hi(sparc64_ttable_tl0), %g1
|
||
|
|
wrpr %g1, %tba
|
||
|
|
mov %o2, %g6
|
||
|
|
|
||
|
|
/* Set up MMU globals */
|
||
|
|
wrpr %o1, (PSTATE_MG|PSTATE_IE), %pstate
|
||
|
|
|
||
|
|
/* Set fixed globals used by dTLB miss handler. */
|
||
|
|
#define KERN_HIGHBITS ((_PAGE_VALID|_PAGE_SZ4MB)^0xfffff80000000000)
|
||
|
|
#define KERN_LOWBITS (_PAGE_CP | _PAGE_CV | _PAGE_P | _PAGE_W)
|
||
|
|
|
||
|
|
mov TSB_REG, %g1
|
||
|
|
stxa %g0, [%g1] ASI_DMMU
|
||
|
|
membar #Sync
|
||
|
|
stxa %g0, [%g1] ASI_IMMU
|
||
|
|
membar #Sync
|
||
|
|
mov TLB_SFSR, %g1
|
||
|
|
sethi %uhi(KERN_HIGHBITS), %g2
|
||
|
|
or %g2, %ulo(KERN_HIGHBITS), %g2
|
||
|
|
sllx %g2, 32, %g2
|
||
|
|
or %g2, KERN_LOWBITS, %g2
|
||
|
|
|
||
|
|
BRANCH_IF_ANY_CHEETAH(g3,g7,cheetah_vpte_base)
|
||
|
|
ba,pt %xcc, spitfire_vpte_base
|
||
|
|
nop
|
||
|
|
|
||
|
|
cheetah_vpte_base:
|
||
|
|
sethi %uhi(VPTE_BASE_CHEETAH), %g3
|
||
|
|
or %g3, %ulo(VPTE_BASE_CHEETAH), %g3
|
||
|
|
ba,pt %xcc, 2f
|
||
|
|
sllx %g3, 32, %g3
|
||
|
|
|
||
|
|
spitfire_vpte_base:
|
||
|
|
sethi %uhi(VPTE_BASE_SPITFIRE), %g3
|
||
|
|
or %g3, %ulo(VPTE_BASE_SPITFIRE), %g3
|
||
|
|
sllx %g3, 32, %g3
|
||
|
|
|
||
|
|
2:
|
||
|
|
clr %g7
|
||
|
|
#undef KERN_HIGHBITS
|
||
|
|
#undef KERN_LOWBITS
|
||
|
|
|
||
|
|
/* Kill PROM timer */
|
||
|
|
sethi %hi(0x80000000), %o2
|
||
|
|
sllx %o2, 32, %o2
|
||
|
|
wr %o2, 0, %tick_cmpr
|
||
|
|
|
||
|
|
BRANCH_IF_ANY_CHEETAH(o2,o3,1f)
|
||
|
|
|
||
|
|
ba,pt %xcc, 2f
|
||
|
|
nop
|
||
|
|
|
||
|
|
/* Disable STICK_INT interrupts. */
|
||
|
|
1:
|
||
|
|
sethi %hi(0x80000000), %o2
|
||
|
|
sllx %o2, 32, %o2
|
||
|
|
wr %o2, %asr25
|
||
|
|
|
||
|
|
/* Ok, we're done setting up all the state our trap mechanims needs,
|
||
|
|
* now get back into normal globals and let the PROM know what is up.
|
||
|
|
*/
|
||
|
|
2:
|
||
|
|
wrpr %g0, %g0, %wstate
|
||
|
|
wrpr %o1, PSTATE_IE, %pstate
|
||
|
|
|
||
|
|
call init_irqwork_curcpu
|
||
|
|
nop
|
||
|
|
|
||
|
|
call prom_set_trap_table
|
||
|
|
sethi %hi(sparc64_ttable_tl0), %o0
|
||
|
|
|
||
|
|
BRANCH_IF_CHEETAH_PLUS_OR_FOLLOWON(g2,g3,1f)
|
||
|
|
ba,pt %xcc, 2f
|
||
|
|
nop
|
||
|
|
|
||
|
|
1: /* Start using proper page size encodings in ctx register. */
|
||
|
|
sethi %uhi(CTX_CHEETAH_PLUS_NUC), %g3
|
||
|
|
mov PRIMARY_CONTEXT, %g1
|
||
|
|
sllx %g3, 32, %g3
|
||
|
|
sethi %hi(CTX_CHEETAH_PLUS_CTX0), %g2
|
||
|
|
or %g3, %g2, %g3
|
||
|
|
stxa %g3, [%g1] ASI_DMMU
|
||
|
|
membar #Sync
|
||
|
|
|
||
|
|
2:
|
||
|
|
rdpr %pstate, %o1
|
||
|
|
or %o1, PSTATE_IE, %o1
|
||
|
|
wrpr %o1, 0, %pstate
|
||
|
|
|
||
|
|
ret
|
||
|
|
restore
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The following skips make sure the trap table in ttable.S is aligned
|
||
|
|
* on a 32K boundary as required by the v9 specs for TBA register.
|
||
|
|
*/
|
||
|
|
sparc64_boot_end:
|
||
|
|
.skip 0x2000 + _start - sparc64_boot_end
|
||
|
|
bootup_user_stack_end:
|
||
|
|
.skip 0x2000
|
||
|
|
|
||
|
|
#ifdef CONFIG_SBUS
|
||
|
|
/* This is just a hack to fool make depend config.h discovering
|
||
|
|
strategy: As the .S files below need config.h, but
|
||
|
|
make depend does not find it for them, we include config.h
|
||
|
|
in head.S */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
! 0x0000000000408000
|
||
|
|
|
||
|
|
#include "ttable.S"
|
||
|
|
#include "systbls.S"
|
||
|
|
|
||
|
|
.align 1024
|
||
|
|
.globl swapper_pg_dir
|
||
|
|
swapper_pg_dir:
|
||
|
|
.word 0
|
||
|
|
|
||
|
|
#include "etrap.S"
|
||
|
|
#include "rtrap.S"
|
||
|
|
#include "winfixup.S"
|
||
|
|
#include "entry.S"
|
||
|
|
|
||
|
|
/* This is just anal retentiveness on my part... */
|
||
|
|
.align 16384
|
||
|
|
|
||
|
|
.data
|
||
|
|
.align 8
|
||
|
|
.globl prom_tba, tlb_type
|
||
|
|
prom_tba: .xword 0
|
||
|
|
tlb_type: .word 0 /* Must NOT end up in BSS */
|
||
|
|
.section ".fixup",#alloc,#execinstr
|
||
|
|
.globl __ret_efault
|
||
|
|
__ret_efault:
|
||
|
|
ret
|
||
|
|
restore %g0, -EFAULT, %o0
|
||
|
|
|