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/*

 * 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 "cpu.h"

#include "exec/cpu-all.h"

#include "sysemu/memory_mapping.h"

/* PAE Paging or IA-32e Paging */

static void walk_pte(MemoryMappingList *list, 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 = ldq_phys(pte_addr);

        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,

                      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 = ldl_phys(pte_addr);

        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 0xffffffffff000 /* selects bits 51:12 */

static void walk_pde(MemoryMappingList *list, 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 = ldq_phys(pde_addr);

        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, pte_start_addr, a20_mask, line_addr);

    }

}

/* 32-bit Paging */

static void walk_pde2(MemoryMappingList *list,

                      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 = ldl_phys(pde_addr);

        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, pte_start_addr, a20_mask, line_addr);

    }

}

/* PAE Paging */

static void walk_pdpe2(MemoryMappingList *list,

                       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 = ldq_phys(pdpe_addr);

        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, pde_start_addr, a20_mask, line_addr);

    }

}

#ifdef TARGET_X86_64

/* IA-32e Paging */

static void walk_pdpe(MemoryMappingList *list,

                      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 = ldq_phys(pdpe_addr);

        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, pde_start_addr, a20_mask, line_addr);

    }

}

/* IA-32e Paging */

static void walk_pml4e(MemoryMappingList *list,

                       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 = ldq_phys(pml4e_addr);

        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, 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, pml4e_addr, env->a20_mask);

        } else

#endif

        {

            hwaddr pdpe_addr;

            pdpe_addr = (env->cr[3] & ~0x1f) & env->a20_mask;

            walk_pdpe2(list, 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, pde_addr, env->a20_mask, pse);

    }

}