From 0cac1b66c88c4cd3ec1d358091486787837215a3 Mon Sep 17 00:00:00 2001 From: Blue Swirl Date: Mon, 9 Apr 2012 16:50:52 +0000 Subject: cputlb: move TLB handling to a separate file Move TLB handling and softmmu code load helpers to cputlb.c, compile only for softmmu targets. Signed-off-by: Blue Swirl --- cputlb.c | 362 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 362 insertions(+) create mode 100644 cputlb.c (limited to 'cputlb.c') diff --git a/cputlb.c b/cputlb.c new file mode 100644 index 0000000000..b7d8f07539 --- /dev/null +++ b/cputlb.c @@ -0,0 +1,362 @@ +/* + * Common CPU TLB handling + * + * Copyright (c) 2003 Fabrice Bellard + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see . + */ + +#include "config.h" +#include "cpu.h" +#include "exec-all.h" +#include "memory.h" + +#include "cputlb.h" + +#define WANT_EXEC_OBSOLETE +#include "exec-obsolete.h" + +//#define DEBUG_TLB +//#define DEBUG_TLB_CHECK + +/* statistics */ +int tlb_flush_count; + +static const CPUTLBEntry s_cputlb_empty_entry = { + .addr_read = -1, + .addr_write = -1, + .addr_code = -1, + .addend = -1, +}; + +/* NOTE: + * If flush_global is true (the usual case), flush all tlb entries. + * If flush_global is false, flush (at least) all tlb entries not + * marked global. + * + * Since QEMU doesn't currently implement a global/not-global flag + * for tlb entries, at the moment tlb_flush() will also flush all + * tlb entries in the flush_global == false case. This is OK because + * CPU architectures generally permit an implementation to drop + * entries from the TLB at any time, so flushing more entries than + * required is only an efficiency issue, not a correctness issue. + */ +void tlb_flush(CPUArchState *env, int flush_global) +{ + int i; + +#if defined(DEBUG_TLB) + printf("tlb_flush:\n"); +#endif + /* must reset current TB so that interrupts cannot modify the + links while we are modifying them */ + env->current_tb = NULL; + + for (i = 0; i < CPU_TLB_SIZE; i++) { + int mmu_idx; + + for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) { + env->tlb_table[mmu_idx][i] = s_cputlb_empty_entry; + } + } + + memset(env->tb_jmp_cache, 0, TB_JMP_CACHE_SIZE * sizeof (void *)); + + env->tlb_flush_addr = -1; + env->tlb_flush_mask = 0; + tlb_flush_count++; +} + +static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr) +{ + if (addr == (tlb_entry->addr_read & + (TARGET_PAGE_MASK | TLB_INVALID_MASK)) || + addr == (tlb_entry->addr_write & + (TARGET_PAGE_MASK | TLB_INVALID_MASK)) || + addr == (tlb_entry->addr_code & + (TARGET_PAGE_MASK | TLB_INVALID_MASK))) { + *tlb_entry = s_cputlb_empty_entry; + } +} + +void tlb_flush_page(CPUArchState *env, target_ulong addr) +{ + int i; + int mmu_idx; + +#if defined(DEBUG_TLB) + printf("tlb_flush_page: " TARGET_FMT_lx "\n", addr); +#endif + /* Check if we need to flush due to large pages. */ + if ((addr & env->tlb_flush_mask) == env->tlb_flush_addr) { +#if defined(DEBUG_TLB) + printf("tlb_flush_page: forced full flush (" + TARGET_FMT_lx "/" TARGET_FMT_lx ")\n", + env->tlb_flush_addr, env->tlb_flush_mask); +#endif + tlb_flush(env, 1); + return; + } + /* must reset current TB so that interrupts cannot modify the + links while we are modifying them */ + env->current_tb = NULL; + + addr &= TARGET_PAGE_MASK; + i = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); + for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) { + tlb_flush_entry(&env->tlb_table[mmu_idx][i], addr); + } + + tb_flush_jmp_cache(env, addr); +} + +/* update the TLBs so that writes to code in the virtual page 'addr' + can be detected */ +void tlb_protect_code(ram_addr_t ram_addr) +{ + cpu_physical_memory_reset_dirty(ram_addr, + ram_addr + TARGET_PAGE_SIZE, + CODE_DIRTY_FLAG); +} + +/* update the TLB so that writes in physical page 'phys_addr' are no longer + tested for self modifying code */ +void tlb_unprotect_code_phys(CPUArchState *env, ram_addr_t ram_addr, + target_ulong vaddr) +{ + cpu_physical_memory_set_dirty_flags(ram_addr, CODE_DIRTY_FLAG); +} + +static bool tlb_is_dirty_ram(CPUTLBEntry *tlbe) +{ + return (tlbe->addr_write & (TLB_INVALID_MASK|TLB_MMIO|TLB_NOTDIRTY)) == 0; +} + +void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry, uintptr_t start, + uintptr_t length) +{ + uintptr_t addr; + + if (tlb_is_dirty_ram(tlb_entry)) { + addr = (tlb_entry->addr_write & TARGET_PAGE_MASK) + tlb_entry->addend; + if ((addr - start) < length) { + tlb_entry->addr_write |= TLB_NOTDIRTY; + } + } +} + +static inline void tlb_update_dirty(CPUTLBEntry *tlb_entry) +{ + ram_addr_t ram_addr; + void *p; + + if (tlb_is_dirty_ram(tlb_entry)) { + p = (void *)(uintptr_t)((tlb_entry->addr_write & TARGET_PAGE_MASK) + + tlb_entry->addend); + ram_addr = qemu_ram_addr_from_host_nofail(p); + if (!cpu_physical_memory_is_dirty(ram_addr)) { + tlb_entry->addr_write |= TLB_NOTDIRTY; + } + } +} + +void cpu_tlb_reset_dirty_all(ram_addr_t start1, ram_addr_t length) +{ + CPUArchState *env; + + for (env = first_cpu; env != NULL; env = env->next_cpu) { + int mmu_idx; + + for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) { + unsigned int i; + + for (i = 0; i < CPU_TLB_SIZE; i++) { + tlb_reset_dirty_range(&env->tlb_table[mmu_idx][i], + start1, length); + } + } + } +} + +static inline void tlb_set_dirty1(CPUTLBEntry *tlb_entry, target_ulong vaddr) +{ + if (tlb_entry->addr_write == (vaddr | TLB_NOTDIRTY)) { + tlb_entry->addr_write = vaddr; + } +} + +/* update the TLB corresponding to virtual page vaddr + so that it is no longer dirty */ +void tlb_set_dirty(CPUArchState *env, target_ulong vaddr) +{ + int i; + int mmu_idx; + + vaddr &= TARGET_PAGE_MASK; + i = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); + for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) { + tlb_set_dirty1(&env->tlb_table[mmu_idx][i], vaddr); + } +} + +/* Our TLB does not support large pages, so remember the area covered by + large pages and trigger a full TLB flush if these are invalidated. */ +static void tlb_add_large_page(CPUArchState *env, target_ulong vaddr, + target_ulong size) +{ + target_ulong mask = ~(size - 1); + + if (env->tlb_flush_addr == (target_ulong)-1) { + env->tlb_flush_addr = vaddr & mask; + env->tlb_flush_mask = mask; + return; + } + /* Extend the existing region to include the new page. + This is a compromise between unnecessary flushes and the cost + of maintaining a full variable size TLB. */ + mask &= env->tlb_flush_mask; + while (((env->tlb_flush_addr ^ vaddr) & mask) != 0) { + mask <<= 1; + } + env->tlb_flush_addr &= mask; + env->tlb_flush_mask = mask; +} + +/* Add a new TLB entry. At most one entry for a given virtual address + is permitted. Only a single TARGET_PAGE_SIZE region is mapped, the + supplied size is only used by tlb_flush_page. */ +void tlb_set_page(CPUArchState *env, target_ulong vaddr, + target_phys_addr_t paddr, int prot, + int mmu_idx, target_ulong size) +{ + MemoryRegionSection *section; + unsigned int index; + target_ulong address; + target_ulong code_address; + uintptr_t addend; + CPUTLBEntry *te; + target_phys_addr_t iotlb; + + assert(size >= TARGET_PAGE_SIZE); + if (size != TARGET_PAGE_SIZE) { + tlb_add_large_page(env, vaddr, size); + } + section = phys_page_find(paddr >> TARGET_PAGE_BITS); +#if defined(DEBUG_TLB) + printf("tlb_set_page: vaddr=" TARGET_FMT_lx " paddr=0x" TARGET_FMT_plx + " prot=%x idx=%d pd=0x%08lx\n", + vaddr, paddr, prot, mmu_idx, pd); +#endif + + address = vaddr; + if (!is_ram_rom_romd(section)) { + /* IO memory case (romd handled later) */ + address |= TLB_MMIO; + } + if (is_ram_rom_romd(section)) { + addend = (uintptr_t)memory_region_get_ram_ptr(section->mr) + + section_addr(section, paddr); + } else { + addend = 0; + } + iotlb = memory_region_section_get_iotlb(env, section, vaddr, paddr, prot, + &address); + + code_address = address; + + index = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); + env->iotlb[mmu_idx][index] = iotlb - vaddr; + te = &env->tlb_table[mmu_idx][index]; + te->addend = addend - vaddr; + if (prot & PAGE_READ) { + te->addr_read = address; + } else { + te->addr_read = -1; + } + + if (prot & PAGE_EXEC) { + te->addr_code = code_address; + } else { + te->addr_code = -1; + } + if (prot & PAGE_WRITE) { + if ((memory_region_is_ram(section->mr) && section->readonly) + || is_romd(section)) { + /* Write access calls the I/O callback. */ + te->addr_write = address | TLB_MMIO; + } else if (memory_region_is_ram(section->mr) + && !cpu_physical_memory_is_dirty( + section->mr->ram_addr + + section_addr(section, paddr))) { + te->addr_write = address | TLB_NOTDIRTY; + } else { + te->addr_write = address; + } + } else { + te->addr_write = -1; + } +} + +/* NOTE: this function can trigger an exception */ +/* NOTE2: the returned address is not exactly the physical address: it + is the offset relative to phys_ram_base */ +tb_page_addr_t get_page_addr_code(CPUArchState *env1, target_ulong addr) +{ + int mmu_idx, page_index, pd; + void *p; + MemoryRegion *mr; + + page_index = (addr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1); + mmu_idx = cpu_mmu_index(env1); + if (unlikely(env1->tlb_table[mmu_idx][page_index].addr_code != + (addr & TARGET_PAGE_MASK))) { +#ifdef CONFIG_TCG_PASS_AREG0 + cpu_ldub_code(env1, addr); +#else + ldub_code(addr); +#endif + } + pd = env1->iotlb[mmu_idx][page_index] & ~TARGET_PAGE_MASK; + mr = iotlb_to_region(pd); + if (memory_region_is_unassigned(mr)) { +#if defined(TARGET_ALPHA) || defined(TARGET_MIPS) || defined(TARGET_SPARC) + cpu_unassigned_access(env1, addr, 0, 1, 0, 4); +#else + cpu_abort(env1, "Trying to execute code outside RAM or ROM at 0x" + TARGET_FMT_lx "\n", addr); +#endif + } + p = (void *)((uintptr_t)addr + env1->tlb_table[mmu_idx][page_index].addend); + return qemu_ram_addr_from_host_nofail(p); +} + +#define MMUSUFFIX _cmmu +#undef GETPC +#define GETPC() ((uintptr_t)0) +#define env cpu_single_env +#define SOFTMMU_CODE_ACCESS + +#define SHIFT 0 +#include "softmmu_template.h" + +#define SHIFT 1 +#include "softmmu_template.h" + +#define SHIFT 2 +#include "softmmu_template.h" + +#define SHIFT 3 +#include "softmmu_template.h" + +#undef env -- cgit v1.2.3