Working static paging
This commit is contained in:
Adrien Bourmault
parent
aaf25bd7e9
commit
2c7967f772
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@ -54,7 +54,7 @@ MB_header:
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;;MULTIBOOT POINT ENTRY FOR GRUB -------------------------------------------- ;;
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MB_start:
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mov esp, KERNEL_STACK ; Setup the stack
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mov esp, kernelEnd + 16*1024 ; Setup the stack
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push 0 ; Reset EFLAGS
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popf
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mov [mbInfo], ebx
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@ -80,6 +80,8 @@ Go64:
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mov ecx, 0xC0000080 ; Address of MSR
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rdmsr ; Read MSR
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or eax, 1 << 8 ; LME = 1. (Long Mode Enable)
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or eax, 1 << 11 ; NXE = 1 (No execute bit)
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wrmsr ; Write MSR
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;; Enable paging
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@ -129,16 +131,16 @@ InitStack:
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push rdi
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;; Begin address to fill and length
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mov qword [newStackEnd], KERNEL_STACK
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mov qword [newKernelEnd], kernelEnd
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mov rdi, kernelEnd
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mov qword [kernelEnd], qword 0xbad0bad
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mov rdi, kernelEnd + 16
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mov rcx, (KERNEL_STACK - (kernelEnd + 16)) ; The Stack can begin at
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; kernelEnd + 16 in order to not overwrite the
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; kernel by pushing values (grows downward)
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;; Alignes it to 4096o / FUTURE PAGE FRAME
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shr rdi, 12
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shl rdi, 12
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add rdi, 0x1000
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;; XXX : align the stack to 16bytes
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;; Passing info to kernel
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mov qword [newKernelEnd], rdi
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mov rcx, KERNEL_STACK ; counter
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;; If bit 0 is on, fill one byte
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sar rcx, 1 ; Shift bit 0 into CY
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@ -158,6 +160,10 @@ InitStack:
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;; RCX now equals the number of qwords to fill
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repnz stosq ; Finish by writing RCX qwords.
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;; New info for the kernel
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mov qword [newStackEnd], rdi
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mov rsp, rdi
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pop rdi
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pop rcx
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jmp AfterInitStack
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@ -30,7 +30,7 @@ global newKernelEnd
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global newStackEnd
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[section .text]
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KERNEL_STACK equ (kernelEnd + 16) + 16 * 1024 ; 16KB of stack
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KERNEL_STACK equ 16 * 1024 ; 16KB of stack
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newKernelEnd dq 0x0
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newStackEnd dq 0x0
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@ -141,8 +141,8 @@ void *MmGetFirstAvailZone(void *start) {
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void *current = 0;
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// Because the kernel is the kernel
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if ((ulong)start < (ulong)BtLoaderInfo.stackEndAddr+16) {
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return MmGetFirstAvailZone(BtLoaderInfo.stackEndAddr+16);
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if ((ulong)start < (ulong)BtLoaderInfo.stackEndAddr+4096) {
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return MmGetFirstAvailZone(BtLoaderInfo.stackEndAddr+4096);
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}
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// Search the zone where the start address is
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@ -1,4 +1,5 @@
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#include <kernel.h>
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#include <init/boot.h>
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#define PAGESIZE (4 * KB)
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@ -26,7 +27,8 @@ enum
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MF_CACHEDIS = 1 << 4,
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MF_ACCESSED = 1 << 5,
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MF_DIRTY = 1 << 6,
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MF_HUGE = 1 << 7
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MF_HUGE = 1 << 7,
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MF_NX = 1 << 31
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};
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#define RAM 8
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@ -34,38 +36,67 @@ enum
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//-----------
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volatile pdpe_t PML4[512] __attribute__((__aligned__(4096)));
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volatile pdpe_t MmPML4[512] __attribute__((__aligned__(4096)));
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volatile pde_t PDP[512] __attribute__((__aligned__(4096)));
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volatile pde_t MmPDP[512] __attribute__((__aligned__(4096)));
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volatile pde_t PD[512 * RAM] __attribute__((__aligned__(4096)));
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volatile pde_t MmPD[512 * RAM] __attribute__((__aligned__(4096)));
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volatile pte_t PT[512 * NB_4K] __attribute__((__aligned__(4096)));
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volatile pte_t MmPT[512 * NB_4K] __attribute__((__aligned__(4096)));
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volatile ulong MmStackGuards[2] = { 0 };
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//
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// Creates our new page table structure and loads it
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void MmInitPaging(void)
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{
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memzero((void *)&PML4[0], sizeof(PML4));
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memzero((void *)&PDP[0], sizeof(PDP));
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memzero((void *)&PD[0], sizeof(PD));
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memzero((void *)&PT[0], sizeof(PT));
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memzero((void *)&MmPML4[0], sizeof(MmPML4));
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memzero((void *)&MmPDP[0], sizeof(MmPDP));
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memzero((void *)&MmPD[0], sizeof(MmPD));
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memzero((void *)&MmPT[0], sizeof(MmPT));
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for (int i = 0; i < 512 * NB_4K; i++) {
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PT[i] = ((ulong)i * 4096) | MF_PRESENT | MF_READWRITE;
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// STACK GUARD PAGE
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if ((ulong)i*4096 == (ulong)BtLoaderInfo.stackEndAddr) {
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MmPT[i] = ((ulong)i * 4096) | MF_PRESENT;
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MmStackGuards[0] = i;
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continue;
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}
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// STACK PAGES
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if (
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(ulong)i*4096 < (ulong)BtLoaderInfo.stackEndAddr &&
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(ulong)i*4096 > (ulong)BtLoaderInfo.kernelEndAddr
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) {
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MmPT[i] = ((ulong)i * 4096) | MF_PRESENT | MF_READWRITE;// | MF_NX;
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continue;
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}
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// STACK GARD PAGE
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if ((ulong)i*4096 == (ulong)BtLoaderInfo.kernelEndAddr) {
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MmPT[i] = ((ulong)i * 4096) | MF_PRESENT;
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MmStackGuards[1] = i;
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continue;
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}
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MmPT[i] = ((ulong)i * 4096) | MF_PRESENT | MF_READWRITE;
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}
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for (int i = 0; i < NB_4K; i++) {
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PD[i] = (ulong)(&PT[i*512])| MF_PRESENT | MF_READWRITE;
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MmPD[i] = (ulong)(&MmPT[i*512])| MF_PRESENT | MF_READWRITE;
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}
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for (int i = NB_4K; i < 512 * RAM; i++) {
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PD[i] = ((ulong)i * 2048 * 1024) | MF_PRESENT | MF_READWRITE | MF_HUGE;
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MmPD[i] = ((ulong)i * 2048 * 1024) | MF_PRESENT | MF_READWRITE | MF_HUGE;
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}
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for (int i = 0; i < RAM; i++) {
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PDP[i] = (ulong)(&PD[i*512])| MF_PRESENT | MF_READWRITE;
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MmPDP[i] = (ulong)(&MmPD[i*512])| MF_PRESENT | MF_READWRITE;
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}
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PML4[0] = (ulong)(&PDP[0])| MF_PRESENT | MF_READWRITE;
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MmPML4[0] = (ulong)(&MmPDP[0])| MF_PRESENT | MF_READWRITE;
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MmLoadPML4((void *)PML4);
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MmLoadPML4((void *)MmPML4);
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}
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@ -146,7 +146,7 @@ error_t CmdMemUsage(int argc, char **argv, char *cmdline)
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KernLog("Kernel stack\n");
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KernLog("\tstarts at:\t\t%p (%4luMB + %4luKB + %4luB)\n",
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BtLoaderInfo.kernelEndAddr,
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BtLoaderInfo.stackEndAddr,
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_ADDR_TO_MB((size_t)BtLoaderInfo.stackEndAddr),
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_ADDR_TO_KB((size_t)BtLoaderInfo.stackEndAddr),
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_ADDR_TO_B((size_t)BtLoaderInfo.stackEndAddr));
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@ -229,9 +229,9 @@ error_t CmdPF(int argc, char **argv, char *cmdline)
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}
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extern void KeStartShell(void);
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error_t CmdShell(int argc, char **argv, char *cmdline)
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error_t CmdStackOverflow(int argc, char **argv, char *cmdline)
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{
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KeStartShell();
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CmdStackOverflow(0, 0, 0);
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return EOK;
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}
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@ -248,10 +248,10 @@ Command_t cmdtable[] =
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{ "march", CmdStarWars, "Play the Imperial March"},
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{ "mmap", CmdMemMap, "Show memory map" },
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{ "musage", CmdMemUsage, "Show memory statistics" },
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{ "pfault", CmdPF, "Provokes a PF" },
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{ "pfault", CmdPF, "Provoke a PF" },
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{ "pstest", CmdPsTest, "Scheduler test routine" },
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{ "quit", CmdQuit, "Alias for 'exit'" },
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{ "shell", CmdShell, "New shell instance" },
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{ "so", CmdStackOverflow, "Provoke a stack overflow" },
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{ "time", CmdTime, "Print time" },
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{ NULL, NULL, NULL }
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};
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