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Diffstat (limited to 'target/i386/arch_memory_mapping.c')
-rw-r--r--target/i386/arch_memory_mapping.c281
1 files changed, 281 insertions, 0 deletions
diff --git a/target/i386/arch_memory_mapping.c b/target/i386/arch_memory_mapping.c
new file mode 100644
index 0000000000..88f341e1bb
--- /dev/null
+++ b/target/i386/arch_memory_mapping.c
@@ -0,0 +1,281 @@
+/*
+ * i386 memory mapping
+ *
+ * Copyright Fujitsu, Corp. 2011, 2012
+ *
+ * Authors:
+ * Wen Congyang <wency@cn.fujitsu.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "cpu.h"
+#include "exec/cpu-all.h"
+#include "sysemu/memory_mapping.h"
+
+/* PAE Paging or IA-32e Paging */
+static void walk_pte(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pte_start_addr,
+ int32_t a20_mask, target_ulong start_line_addr)
+{
+ hwaddr pte_addr, start_paddr;
+ uint64_t pte;
+ target_ulong start_vaddr;
+ int i;
+
+ for (i = 0; i < 512; i++) {
+ pte_addr = (pte_start_addr + i * 8) & a20_mask;
+ pte = address_space_ldq(as, pte_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pte & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ start_paddr = (pte & ~0xfff) & ~(0x1ULL << 63);
+ if (cpu_physical_memory_is_io(start_paddr)) {
+ /* I/O region */
+ continue;
+ }
+
+ start_vaddr = start_line_addr | ((i & 0x1ff) << 12);
+ memory_mapping_list_add_merge_sorted(list, start_paddr,
+ start_vaddr, 1 << 12);
+ }
+}
+
+/* 32-bit Paging */
+static void walk_pte2(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pte_start_addr, int32_t a20_mask,
+ target_ulong start_line_addr)
+{
+ hwaddr pte_addr, start_paddr;
+ uint32_t pte;
+ target_ulong start_vaddr;
+ int i;
+
+ for (i = 0; i < 1024; i++) {
+ pte_addr = (pte_start_addr + i * 4) & a20_mask;
+ pte = address_space_ldl(as, pte_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pte & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ start_paddr = pte & ~0xfff;
+ if (cpu_physical_memory_is_io(start_paddr)) {
+ /* I/O region */
+ continue;
+ }
+
+ start_vaddr = start_line_addr | ((i & 0x3ff) << 12);
+ memory_mapping_list_add_merge_sorted(list, start_paddr,
+ start_vaddr, 1 << 12);
+ }
+}
+
+/* PAE Paging or IA-32e Paging */
+#define PLM4_ADDR_MASK 0xffffffffff000ULL /* selects bits 51:12 */
+
+static void walk_pde(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pde_start_addr,
+ int32_t a20_mask, target_ulong start_line_addr)
+{
+ hwaddr pde_addr, pte_start_addr, start_paddr;
+ uint64_t pde;
+ target_ulong line_addr, start_vaddr;
+ int i;
+
+ for (i = 0; i < 512; i++) {
+ pde_addr = (pde_start_addr + i * 8) & a20_mask;
+ pde = address_space_ldq(as, pde_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pde & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ line_addr = start_line_addr | ((i & 0x1ff) << 21);
+ if (pde & PG_PSE_MASK) {
+ /* 2 MB page */
+ start_paddr = (pde & ~0x1fffff) & ~(0x1ULL << 63);
+ if (cpu_physical_memory_is_io(start_paddr)) {
+ /* I/O region */
+ continue;
+ }
+ start_vaddr = line_addr;
+ memory_mapping_list_add_merge_sorted(list, start_paddr,
+ start_vaddr, 1 << 21);
+ continue;
+ }
+
+ pte_start_addr = (pde & PLM4_ADDR_MASK) & a20_mask;
+ walk_pte(list, as, pte_start_addr, a20_mask, line_addr);
+ }
+}
+
+/* 32-bit Paging */
+static void walk_pde2(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pde_start_addr, int32_t a20_mask,
+ bool pse)
+{
+ hwaddr pde_addr, pte_start_addr, start_paddr, high_paddr;
+ uint32_t pde;
+ target_ulong line_addr, start_vaddr;
+ int i;
+
+ for (i = 0; i < 1024; i++) {
+ pde_addr = (pde_start_addr + i * 4) & a20_mask;
+ pde = address_space_ldl(as, pde_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pde & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ line_addr = (((unsigned int)i & 0x3ff) << 22);
+ if ((pde & PG_PSE_MASK) && pse) {
+ /*
+ * 4 MB page:
+ * bits 39:32 are bits 20:13 of the PDE
+ * bit3 31:22 are bits 31:22 of the PDE
+ */
+ high_paddr = ((hwaddr)(pde & 0x1fe000) << 19);
+ start_paddr = (pde & ~0x3fffff) | high_paddr;
+ if (cpu_physical_memory_is_io(start_paddr)) {
+ /* I/O region */
+ continue;
+ }
+ start_vaddr = line_addr;
+ memory_mapping_list_add_merge_sorted(list, start_paddr,
+ start_vaddr, 1 << 22);
+ continue;
+ }
+
+ pte_start_addr = (pde & ~0xfff) & a20_mask;
+ walk_pte2(list, as, pte_start_addr, a20_mask, line_addr);
+ }
+}
+
+/* PAE Paging */
+static void walk_pdpe2(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pdpe_start_addr, int32_t a20_mask)
+{
+ hwaddr pdpe_addr, pde_start_addr;
+ uint64_t pdpe;
+ target_ulong line_addr;
+ int i;
+
+ for (i = 0; i < 4; i++) {
+ pdpe_addr = (pdpe_start_addr + i * 8) & a20_mask;
+ pdpe = address_space_ldq(as, pdpe_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pdpe & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ line_addr = (((unsigned int)i & 0x3) << 30);
+ pde_start_addr = (pdpe & ~0xfff) & a20_mask;
+ walk_pde(list, as, pde_start_addr, a20_mask, line_addr);
+ }
+}
+
+#ifdef TARGET_X86_64
+/* IA-32e Paging */
+static void walk_pdpe(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pdpe_start_addr, int32_t a20_mask,
+ target_ulong start_line_addr)
+{
+ hwaddr pdpe_addr, pde_start_addr, start_paddr;
+ uint64_t pdpe;
+ target_ulong line_addr, start_vaddr;
+ int i;
+
+ for (i = 0; i < 512; i++) {
+ pdpe_addr = (pdpe_start_addr + i * 8) & a20_mask;
+ pdpe = address_space_ldq(as, pdpe_addr, MEMTXATTRS_UNSPECIFIED, NULL);
+ if (!(pdpe & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ line_addr = start_line_addr | ((i & 0x1ffULL) << 30);
+ if (pdpe & PG_PSE_MASK) {
+ /* 1 GB page */
+ start_paddr = (pdpe & ~0x3fffffff) & ~(0x1ULL << 63);
+ if (cpu_physical_memory_is_io(start_paddr)) {
+ /* I/O region */
+ continue;
+ }
+ start_vaddr = line_addr;
+ memory_mapping_list_add_merge_sorted(list, start_paddr,
+ start_vaddr, 1 << 30);
+ continue;
+ }
+
+ pde_start_addr = (pdpe & PLM4_ADDR_MASK) & a20_mask;
+ walk_pde(list, as, pde_start_addr, a20_mask, line_addr);
+ }
+}
+
+/* IA-32e Paging */
+static void walk_pml4e(MemoryMappingList *list, AddressSpace *as,
+ hwaddr pml4e_start_addr, int32_t a20_mask)
+{
+ hwaddr pml4e_addr, pdpe_start_addr;
+ uint64_t pml4e;
+ target_ulong line_addr;
+ int i;
+
+ for (i = 0; i < 512; i++) {
+ pml4e_addr = (pml4e_start_addr + i * 8) & a20_mask;
+ pml4e = address_space_ldq(as, pml4e_addr, MEMTXATTRS_UNSPECIFIED,
+ NULL);
+ if (!(pml4e & PG_PRESENT_MASK)) {
+ /* not present */
+ continue;
+ }
+
+ line_addr = ((i & 0x1ffULL) << 39) | (0xffffULL << 48);
+ pdpe_start_addr = (pml4e & PLM4_ADDR_MASK) & a20_mask;
+ walk_pdpe(list, as, pdpe_start_addr, a20_mask, line_addr);
+ }
+}
+#endif
+
+void x86_cpu_get_memory_mapping(CPUState *cs, MemoryMappingList *list,
+ Error **errp)
+{
+ X86CPU *cpu = X86_CPU(cs);
+ CPUX86State *env = &cpu->env;
+
+ if (!cpu_paging_enabled(cs)) {
+ /* paging is disabled */
+ return;
+ }
+
+ if (env->cr[4] & CR4_PAE_MASK) {
+#ifdef TARGET_X86_64
+ if (env->hflags & HF_LMA_MASK) {
+ hwaddr pml4e_addr;
+
+ pml4e_addr = (env->cr[3] & PLM4_ADDR_MASK) & env->a20_mask;
+ walk_pml4e(list, cs->as, pml4e_addr, env->a20_mask);
+ } else
+#endif
+ {
+ hwaddr pdpe_addr;
+
+ pdpe_addr = (env->cr[3] & ~0x1f) & env->a20_mask;
+ walk_pdpe2(list, cs->as, pdpe_addr, env->a20_mask);
+ }
+ } else {
+ hwaddr pde_addr;
+ bool pse;
+
+ pde_addr = (env->cr[3] & ~0xfff) & env->a20_mask;
+ pse = !!(env->cr[4] & CR4_PSE_MASK);
+ walk_pde2(list, cs->as, pde_addr, env->a20_mask, pse);
+ }
+}
+
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-15 15:28:47 +0000