diff options
Diffstat (limited to 'arch/arm.c')
| -rw-r--r-- | arch/arm.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/arch/arm.c b/arch/arm.c new file mode 100644 index 0000000..af7442a --- /dev/null +++ b/arch/arm.c @@ -0,0 +1,169 @@ +/* + * arm.c + * + * Created by: Mika Westerberg <ext-mika.1.westerberg@nokia.com> + * Copyright (C) 2010 Nokia Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#ifdef __arm__ + +#include "../print_info.h" +#include "../elf_info.h" +#include "../makedumpfile.h" + +#define PMD_TYPE_MASK 3 +#define PMD_TYPE_SECT 2 +#define PMD_TYPE_TABLE 1 + +#define pgd_index(vaddr) ((vaddr) >> PGDIR_SHIFT) +#define pte_index(vaddr) ((vaddr >> PAGESHIFT()) & (PTRS_PER_PTE - 1)) + +#define pgd_offset(pgdir, vaddr) \ + ((pgdir) + pgd_index(vaddr) * 2 * sizeof(unsigned long)) +#define pmd_offset(dir, vaddr) (dir) +#define pte_offset(pmd, vaddr) \ + (pmd_page_vaddr(pmd) + pte_index(vaddr) * sizeof(unsigned long)) + +/* + * These only work for kernel directly mapped addresses. + */ +#define __va(paddr) ((paddr) - info->phys_base + info->page_offset) +#define __pa(vaddr) ((vaddr) - info->page_offset + info->phys_base) + +static inline unsigned long +pmd_page_vaddr(unsigned long pmd) +{ + unsigned long ptr; + + ptr = pmd & ~(PTRS_PER_PTE * sizeof(void *) - 1); + ptr += PTRS_PER_PTE * sizeof(void *); + + return __va(ptr); +} + +int +get_phys_base_arm(void) +{ + unsigned long phys_base = ULONG_MAX; + unsigned long long phys_start; + int i; + + /* + * We resolve phys_base from PT_LOAD segments. LMA contains physical + * address of the segment, and we use the first one. + */ + for (i = 0; get_pt_load(i, &phys_start, NULL, NULL, NULL); i++) { + if (phys_start < phys_base) + phys_base = phys_start; + } + + if (phys_base == ULONG_MAX) { + ERRMSG("Can't determine phys_base.\n"); + return FALSE; + } + + info->phys_base = phys_base; + DEBUG_MSG("phys_base : %lx\n", phys_base); + + return TRUE; +} + +int +get_machdep_info_arm(void) +{ + info->page_offset = SYMBOL(_stext) & 0xffff0000UL; + info->max_physmem_bits = _MAX_PHYSMEM_BITS; + info->kernel_start = SYMBOL(_stext); + info->section_size_bits = _SECTION_SIZE_BITS; + + DEBUG_MSG("page_offset : %lx\n", info->page_offset); + DEBUG_MSG("kernel_start : %lx\n", info->kernel_start); + + return TRUE; +} + +/* + * vtop_arm() - translate arbitrary virtual address to physical + * @vaddr: virtual address to translate + * + * Function translates @vaddr into physical address using page tables. This + * address can be any virtual address. Returns physical address of the + * corresponding virtual address or %NOT_PADDR when there is no translation. + */ +static unsigned long long +vtop_arm(unsigned long vaddr) +{ + unsigned long long paddr = NOT_PADDR; + unsigned long ptr, pgd, pte, pmd; + + if (SYMBOL(swapper_pg_dir) == NOT_FOUND_SYMBOL) { + ERRMSG("Can't get the symbol of swapper_pg_dir.\n"); + return NOT_PADDR; + } + + ptr = pgd_offset(SYMBOL(swapper_pg_dir), vaddr); + if (!readmem(VADDR, ptr, &pgd, sizeof(pmd))) { + ERRMSG("Can't read pgd\n"); + return NOT_PADDR; + } + + if (info->vaddr_for_vtop == vaddr) + MSG(" PGD : %08lx => %08lx\n", ptr, pgd); + + pmd = pmd_offset(pgd, vaddr); + + switch (pmd & PMD_TYPE_MASK) { + case PMD_TYPE_TABLE: { + /* 4k small page */ + ptr = pte_offset(pmd, vaddr); + if (!readmem(VADDR, ptr, &pte, sizeof(pte))) { + ERRMSG("Can't read pte\n"); + return NOT_PADDR; + } + + if (info->vaddr_for_vtop == vaddr) + MSG(" PTE : %08lx => %08lx\n", ptr, pte); + + if (!(pte & _PAGE_PRESENT)) { + ERRMSG("Can't get a valid pte.\n"); + return NOT_PADDR; + } + + paddr = PAGEBASE(pte) + (vaddr & (PAGESIZE() - 1)); + break; + } + + case PMD_TYPE_SECT: + /* 1MB section */ + pte = pmd & PMD_MASK; + paddr = pte + (vaddr & (PMD_SIZE - 1)); + break; + } + + return paddr; +} + +unsigned long long +vaddr_to_paddr_arm(unsigned long vaddr) +{ + /* + * Only use translation tables when user has explicitly requested us to + * perform translation for a given address. Otherwise we assume that the + * translation is done within the kernel direct mapped region. + */ + if (info->vaddr_for_vtop == vaddr) + return vtop_arm(vaddr); + + return __pa(vaddr); +} + +#endif /* __arm__ */ |