91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <linux/vmalloc.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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/* called with the page_table_lock held */
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static inline void
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remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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{
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unsigned long end;
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unsigned long pfn;
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address &= ~PMD_MASK;
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end = address + size;
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if (end > PMD_SIZE)
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end = PMD_SIZE;
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if (address >= end)
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BUG();
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pfn = phys_addr >> PAGE_SHIFT;
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do {
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if (!pte_none(*pte)) {
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printk("remap_area_pte: page already exists\n");
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BUG();
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}
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set_pte(pte, pfn_pte(pfn,
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__pgprot(_PAGE_VALID | _PAGE_ASM |
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_PAGE_KRE | _PAGE_KWE | flags)));
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address += PAGE_SIZE;
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pfn++;
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pte++;
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} while (address && (address < end));
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}
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/* called with the page_table_lock held */
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static inline int
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remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
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unsigned long phys_addr, unsigned long flags)
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{
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unsigned long end;
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address &= ~PGDIR_MASK;
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end = address + size;
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if (end > PGDIR_SIZE)
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end = PGDIR_SIZE;
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phys_addr -= address;
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if (address >= end)
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BUG();
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do {
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pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
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if (!pte)
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return -ENOMEM;
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remap_area_pte(pte, address, end - address,
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address + phys_addr, flags);
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address = (address + PMD_SIZE) & PMD_MASK;
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pmd++;
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} while (address && (address < end));
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return 0;
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}
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int
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__alpha_remap_area_pages(unsigned long address, unsigned long phys_addr,
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unsigned long size, unsigned long flags)
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{
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pgd_t * dir;
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int error = 0;
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unsigned long end = address + size;
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phys_addr -= address;
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dir = pgd_offset(&init_mm, address);
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flush_cache_all();
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if (address >= end)
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BUG();
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spin_lock(&init_mm.page_table_lock);
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do {
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pmd_t *pmd;
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pmd = pmd_alloc(&init_mm, dir, address);
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error = -ENOMEM;
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if (!pmd)
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break;
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if (remap_area_pmd(pmd, address, end - address,
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phys_addr + address, flags))
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break;
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error = 0;
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address = (address + PGDIR_SIZE) & PGDIR_MASK;
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dir++;
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} while (address && (address < end));
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spin_unlock(&init_mm.page_table_lock);
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return error;
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}
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