diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/pgtable_64.h | 12 | ||||
| -rw-r--r-- | arch/sparc/kernel/ktlb.S | 42 | ||||
| -rw-r--r-- | arch/sparc/mm/init_64.c | 43 | ||||
| -rw-r--r-- | arch/sparc/mm/init_64.h | 7 |
4 files changed, 76 insertions, 28 deletions
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index b049abf9902..0ff92fa2206 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -726,11 +726,17 @@ extern unsigned long pte_file(pte_t); extern pte_t pgoff_to_pte(unsigned long); #define PTE_FILE_MAX_BITS (64UL - PAGE_SHIFT - 1UL) -extern unsigned long *sparc64_valid_addr_bitmap; +extern unsigned long sparc64_valid_addr_bitmap[]; /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ -#define kern_addr_valid(addr) \ - (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap)) +static inline bool kern_addr_valid(unsigned long addr) +{ + unsigned long paddr = __pa(addr); + + if ((paddr >> 41UL) != 0UL) + return false; + return test_bit(paddr >> 22, sparc64_valid_addr_bitmap); +} extern int page_in_phys_avail(unsigned long paddr); diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S index cef8defcd7a..3ea6e8cde8c 100644 --- a/arch/sparc/kernel/ktlb.S +++ b/arch/sparc/kernel/ktlb.S @@ -151,12 +151,46 @@ kvmap_dtlb_4v: * Must preserve %g1 and %g6 (TAG). */ kvmap_dtlb_tsb4m_miss: - sethi %hi(kpte_linear_bitmap), %g2 - or %g2, %lo(kpte_linear_bitmap), %g2 + /* Clear the PAGE_OFFSET top virtual bits, shift + * down to get PFN, and make sure PFN is in range. + */ + sllx %g4, 21, %g5 - /* Clear the PAGE_OFFSET top virtual bits, then shift - * down to get a 256MB physical address index. + /* Check to see if we know about valid memory at the 4MB + * chunk this physical address will reside within. */ + srlx %g5, 21 + 41, %g2 + brnz,pn %g2, kvmap_dtlb_longpath + nop + + /* This unconditional branch and delay-slot nop gets patched + * by the sethi sequence once the bitmap is properly setup. + */ + .globl valid_addr_bitmap_insn +valid_addr_bitmap_insn: + ba,pt %xcc, 2f + nop + .subsection 2 + .globl valid_addr_bitmap_patch +valid_addr_bitmap_patch: + sethi %hi(sparc64_valid_addr_bitmap), %g7 + or %g7, %lo(sparc64_valid_addr_bitmap), %g7 + .previous + + srlx %g5, 21 + 22, %g2 + srlx %g2, 6, %g5 + and %g2, 63, %g2 + sllx %g5, 3, %g5 + ldx [%g7 + %g5], %g5 + mov 1, %g7 + sllx %g7, %g2, %g7 + andcc %g5, %g7, %g0 + be,pn %xcc, kvmap_dtlb_longpath + +2: sethi %hi(kpte_linear_bitmap), %g2 + or %g2, %lo(kpte_linear_bitmap), %g2 + + /* Get the 256MB physical address index. */ sllx %g4, 21, %g5 mov 1, %g7 srlx %g5, 21 + 28, %g5 diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c index ed6be6ba2f4..a70a5e1904d 100644 --- a/arch/sparc/mm/init_64.c +++ b/arch/sparc/mm/init_64.c @@ -145,7 +145,8 @@ static void __init read_obp_memory(const char *property, cmp_p64, NULL); } -unsigned long *sparc64_valid_addr_bitmap __read_mostly; +unsigned long sparc64_valid_addr_bitmap[VALID_ADDR_BITMAP_BYTES / + sizeof(unsigned long)]; EXPORT_SYMBOL(sparc64_valid_addr_bitmap); /* Kernel physical address base and size in bytes. */ @@ -1874,7 +1875,7 @@ static int pavail_rescan_ents __initdata; * memory list again, and make sure it provides at least as much * memory as 'pavail' does. */ -static void __init setup_valid_addr_bitmap_from_pavail(void) +static void __init setup_valid_addr_bitmap_from_pavail(unsigned long *bitmap) { int i; @@ -1897,8 +1898,7 @@ static void __init setup_valid_addr_bitmap_from_pavail(void) if (new_start <= old_start && new_end >= (old_start + PAGE_SIZE)) { - set_bit(old_start >> 22, - sparc64_valid_addr_bitmap); + set_bit(old_start >> 22, bitmap); goto do_next_page; } } @@ -1919,20 +1919,21 @@ static void __init setup_valid_addr_bitmap_from_pavail(void) } } +static void __init patch_tlb_miss_handler_bitmap(void) +{ + extern unsigned int valid_addr_bitmap_insn[]; + extern unsigned int valid_addr_bitmap_patch[]; + + valid_addr_bitmap_insn[1] = valid_addr_bitmap_patch[1]; + mb(); + valid_addr_bitmap_insn[0] = valid_addr_bitmap_patch[0]; + flushi(&valid_addr_bitmap_insn[0]); +} + void __init mem_init(void) { unsigned long codepages, datapages, initpages; unsigned long addr, last; - int i; - - i = last_valid_pfn >> ((22 - PAGE_SHIFT) + 6); - i += 1; - sparc64_valid_addr_bitmap = (unsigned long *) alloc_bootmem(i << 3); - if (sparc64_valid_addr_bitmap == NULL) { - prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); - prom_halt(); - } - memset(sparc64_valid_addr_bitmap, 0, i << 3); addr = PAGE_OFFSET + kern_base; last = PAGE_ALIGN(kern_size) + addr; @@ -1941,15 +1942,19 @@ void __init mem_init(void) addr += PAGE_SIZE; } - setup_valid_addr_bitmap_from_pavail(); + setup_valid_addr_bitmap_from_pavail(sparc64_valid_addr_bitmap); + patch_tlb_miss_handler_bitmap(); high_memory = __va(last_valid_pfn << PAGE_SHIFT); #ifdef CONFIG_NEED_MULTIPLE_NODES - for_each_online_node(i) { - if (NODE_DATA(i)->node_spanned_pages != 0) { - totalram_pages += - free_all_bootmem_node(NODE_DATA(i)); + { + int i; + for_each_online_node(i) { + if (NODE_DATA(i)->node_spanned_pages != 0) { + totalram_pages += + free_all_bootmem_node(NODE_DATA(i)); + } } } #else diff --git a/arch/sparc/mm/init_64.h b/arch/sparc/mm/init_64.h index 16063870a48..c2f772dbd55 100644 --- a/arch/sparc/mm/init_64.h +++ b/arch/sparc/mm/init_64.h @@ -5,10 +5,13 @@ * marked non-static so that assembler code can get at them. */ -#define MAX_PHYS_ADDRESS (1UL << 42UL) -#define KPTE_BITMAP_CHUNK_SZ (256UL * 1024UL * 1024UL) +#define MAX_PHYS_ADDRESS (1UL << 41UL) +#define KPTE_BITMAP_CHUNK_SZ (256UL * 1024UL * 1024UL) #define KPTE_BITMAP_BYTES \ ((MAX_PHYS_ADDRESS / KPTE_BITMAP_CHUNK_SZ) / 8) +#define VALID_ADDR_BITMAP_CHUNK_SZ (4UL * 1024UL * 1024UL) +#define VALID_ADDR_BITMAP_BYTES \ + ((MAX_PHYS_ADDRESS / VALID_ADDR_BITMAP_CHUNK_SZ) / 8) extern unsigned long kern_linear_pte_xor[2]; extern unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)]; |