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New dynamic paging implementation

This commit is contained in:
Adrien Bourmault 2020-01-09 18:19:49 +01:00
parent 675063840f
commit 9fde358447
7 changed files with 181 additions and 111 deletions
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1
include/io/vga.h
View File

@ -59,6 +59,7 @@ extern const char *RtlColorNames[VGA_COLOR_WHITE+1];
#define RtlCharToColor(c) ((c) - 130)
uint IoGetScroll(void);
void IoSetScroll(uint);
void IoScrollUp(void);
void IoScrollDown(void);

15
include/mm/mm.h
View File

@ -172,15 +172,18 @@ void *MmGetStackGuards(char rank);
//
void *MmTranslateKPageToAddr(void *rank);
// Page directory pointer offset
typedef ulong pdpe_t;
// Page directory offset
typedef ulong pde_t;
// Page table entry
typedef ulong pte_t;
// Page directory offset
typedef pte_t* pde_t;
// Page directory pointer offset
typedef pde_t* pdpe_t;
// Page directory L4 pointer offset
typedef pdpe_t* pml4_t;
// paging.asm
void MmLoadPML4(void *);
void MmEnableWriteProtect(void);

5
kaleid/kernel/io/vga.c
View File

@ -113,6 +113,11 @@ uint IoGetScroll(void)
return bscroll;
}
void IoSetScroll(uint value)
{
bscroll = 0;
}
void IoScrollDown(void)
{
BLockBuf(BStdOut);

258
kaleid/kernel/mm/paging.c
View File

@ -1,38 +1,18 @@
#include <kernel.h>
#include <init/boot.h>
#include <ex/malloc.h>
#include <mm/heap.h>
#include <mm/mm.h>
#include <ke/idt.h>
#include <lib/buf.h>
#include <io/vga.h>
enum
{
MF_PRESENT = 1 << 0,
MF_READWRITE = 1 << 1,
MF_USERMODE = 1 << 2,
MF_WRITETHR = 1 << 3,
MF_CACHEDIS = 1 << 4,
MF_ACCESSED = 1 << 5,
MF_DIRTY = 1 << 6,
MF_HUGE = 1 << 7,
MF_NX = 1 << 31
};
#define RAM_MAX 32
#define NB_4K 150
// * 2 MB
#define USERSPACE 0x40000000
//-----------
volatile pdpe_t MmPML4[512] __attribute__((__aligned__(KPAGESIZE)));
volatile pde_t MmPDP[512] __attribute__((__aligned__(KPAGESIZE)));
volatile pde_t MmPD[512 * RAM_MAX] __attribute__((__aligned__(KPAGESIZE)));;
volatile pte_t MmPT[512 * NB_4K] __attribute__((__aligned__(KPAGESIZE)));;
volatile pml4_t MmPageMapLevel4[512] __attribute__((__aligned__(KPAGESIZE)));
volatile pml4_t MmPageMapLevel4Unmasked[512] __attribute__((__aligned__(KPAGESIZE)));
extern ulong _text;
extern ulong _text_end;
@ -42,6 +22,20 @@ extern ulong _data;
extern ulong _data_end;
ulong MmStackGuards[2] = { 0 };
ulong MmVirtLastAddress = 0;
enum
{
PRESENT = 1 << 0,
READWRITE = 1 << 1,
USERMODE = 1 << 2,
WRITETHR = 1 << 3,
CACHEDIS = 1 << 4,
ACCESSED = 1 << 5,
DIRTY = 1 << 6,
HUGE = 1 << 7,
NX = 1 << 31
};
//
// Creates our new page table structure and loads it
@ -49,80 +43,129 @@ ulong MmStackGuards[2] = { 0 };
void MmInitPaging(void)
{
extern MemoryMap_t memoryMap;
pdpe_t *MmPDP;
pde_t *MmPD;
pte_t *MmPT;
ulong index;
ulong lastKernelAddr = (ulong)(_heap_start + _heap_max);
ulong firstDirectoryAddr = 0;
ulong lastDirectoryAddr = 0;
// Maximum PHYSICAL address in memory
ulong phRamSize = memoryMap.freeRamSize + memoryMap.nonfreeRamSize;
memzero((void *)&MmPML4[0], sizeof(MmPML4));
memzero((void *)&MmPDP[0], sizeof(MmPDP));
memzero((void *)&MmPD[0], sizeof(MmPD));
memzero((void *)&MmPT[0], sizeof(MmPT));
// Difference between the end of kernel and the begin of userspace
ulong diffKernUsr = (ulong)USERSPACE - lastKernelAddr;
for (volatile ulong i = 0; i < 512 * NB_4K; i++) {
// STACK GUARD PAGE
if ((ulong)(i*KPAGESIZE) == (ulong)BtLoaderInfo.stackEndAddr) {
MmPT[i] = ((ulong)(i*KPAGESIZE));
MmStackGuards[0] = ((ulong)(i*KPAGESIZE ));
continue;
}
// Maximum VIRTUAL address in memory
MmVirtLastAddress = phRamSize + diffKernUsr;
// ENOMEM like
if ((ulong)(i*KPAGESIZE) > (ulong)phRamSize) {
break;
}
DebugLog("\tPaging gap : %u MB (%p)\n\tLast virtual address %p\n", diffKernUsr / MB, diffKernUsr, MmVirtLastAddress);
// STACK GARD PAGE
if ((ulong)(i*KPAGESIZE) == (ulong)BtLoaderInfo.kernelEndAddr) {
MmPT[i] = ((ulong)(i*KPAGESIZE));
MmStackGuards[1] = ((ulong)(i*KPAGESIZE));
continue;
}
memzero((void *)&MmPageMapLevel4[0], sizeof(MmPageMapLevel4));
memzero((void *)&MmPageMapLevel4Unmasked[0], sizeof(MmPageMapLevel4));
// TEXT
if ((ulong)(i*KPAGESIZE) >= (ulong)&_text && (ulong)(i*KPAGESIZE) <= (ulong)&_text_end) {
MmPT[i] = ((ulong)(i*KPAGESIZE))| MF_PRESENT;
continue;
}
// RODATA
if ((ulong)(i*KPAGESIZE) >= (ulong)&_rodata && (ulong)(i*KPAGESIZE) <= (ulong)&_rodata_end) {
MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR;
continue;
}
for (ulong curAddrPML4 = 0;
curAddrPML4 < MmVirtLastAddress;
curAddrPML4 += ((ulong)KPAGESIZE * 0x8000000)) {
// Create an entry in PML4 each 512GB
// 0x8000000 = 512 ^ 3
// DATA
if ((ulong)(i*KPAGESIZE) >= (ulong)&_data && (ulong)(i*KPAGESIZE) <= (ulong)&_data_end) {
MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR | MF_READWRITE;
continue;
}
MmPDP = (pdpe_t *)malloc(512*sizeof(pde_t));
MmPT[i] = ((ulong)(i*KPAGESIZE)) | MF_PRESENT | MF_WRITETHR | MF_READWRITE;
if (!firstDirectoryAddr) {
firstDirectoryAddr = (ulong)MmPDP;
}
index = (curAddrPML4 / ((ulong)KPAGESIZE * 0x8000000)) % 512;
//DebugLog("\t\t\t\tPDP %d : %p\n", index, MmPDP);
MmPageMapLevel4[index] = (pdpe_t *)((ulong)MmPDP | PRESENT | READWRITE);
for (ulong curAddrPDP = curAddrPML4;
curAddrPDP < (curAddrPML4 + ((ulong)KPAGESIZE * 0x8000000)) &&
curAddrPDP < MmVirtLastAddress;
curAddrPDP += ((ulong)KPAGESIZE * 0x40000)) {
// Create an intry in PDP each 1GB
// 0x40000 = 512 ^ 2
MmPD = (pde_t *)malloc(512*sizeof(pde_t));
index = (curAddrPDP / ((ulong)KPAGESIZE * 0x40000)) % 512;
//DebugLog("\t\t\t\tPD %d : %p\n", index, MmPD);
MmPDP[index] = (pde_t *)((ulong)MmPD | PRESENT | READWRITE);
for (ulong curAddrPD = curAddrPDP;
curAddrPD < (curAddrPDP + ((ulong)KPAGESIZE * 0x40000)) &&
curAddrPD < MmVirtLastAddress;
curAddrPD += ((ulong)KPAGESIZE * 0x200)) {
// Create an intry in PD each 2MB
// 0x200 = 512
MmPT = (pte_t *)malloc(512*sizeof(pte_t));
index = (curAddrPD / ((ulong)KPAGESIZE * 0x200)) % 512;
//DebugLog("\t\t\t\tPT %d : %p\n", index, MmPT);
MmPD[index] = (pte_t *)((ulong)MmPT | PRESENT | READWRITE);
for (ulong curAddrPT = curAddrPD;
curAddrPT < (curAddrPD + ((ulong)KPAGESIZE * 0x200)) &&
curAddrPT < MmVirtLastAddress;
curAddrPT += (ulong)KPAGESIZE) {
// Create an entry in PT each page of 4KB
index = (curAddrPT / ((ulong)KPAGESIZE)) % 512;
//DebugLog("\t\t\t\tPage %d : %p\n", index, curAddrPT);
// STACK GUARD PAGE */
if ((ulong)curAddrPT == (ulong)BtLoaderInfo.stackEndAddr) {
MmPT[index] = (ulong)curAddrPT | PRESENT;
MmStackGuards[0] = (ulong)curAddrPT;
//DebugLog("\tStack Guard at %p\n", curAddrPT);
}
else if ((ulong)curAddrPT == (ulong)BtLoaderInfo.kernelEndAddr) {
MmPT[index] = (ulong)curAddrPT | PRESENT;
MmStackGuards[1] = (ulong)curAddrPT;
//DebugLog("\tStack Guard at %p\n", curAddrPT);
}
// SECTION .TEXT PROTECTION
else if ((ulong)curAddrPT >= (ulong)&_text && (ulong)curAddrPT <= (ulong)&_text_end) {
MmPT[index] = (ulong)curAddrPT | PRESENT;
//DebugLog("\tSection .text at %p\n", curAddrPT);
}
// SECTION .DATA PROTECTION
else if ((ulong)curAddrPT >= (ulong)&_data && (ulong)curAddrPT <= (ulong)&_data_end) {
MmPT[index] = (ulong)curAddrPT | PRESENT | WRITETHR | READWRITE;
//DebugLog("\tSection .data at %p\n", curAddrPT);
}
// SECTION .RODATA PROTECTION
else if ((ulong)curAddrPT >= (ulong)&_rodata && (ulong)curAddrPT <= (ulong)&_rodata_end) {
MmPT[index] = (ulong)curAddrPT | PRESENT | WRITETHR;
//DebugLog("\tSection .rodata at %p\n", curAddrPT);
}
else if ((ulong)curAddrPT <= lastKernelAddr) {
MmPT[index] = (ulong)curAddrPT | PRESENT | READWRITE;
}
else if ((ulong)curAddrPT >= USERSPACE) {
MmPT[index] = ((ulong)curAddrPT - diffKernUsr) | READWRITE | USERMODE; // Not present for instance
if ((ulong)curAddrPT == USERSPACE) {
DebugLog("\tMapped userspace at %p\n", curAddrPT);
}
}
}
}
}
}
lastDirectoryAddr = MmPT;
for (volatile ulong i = 0; i < NB_4K; i++) {
MmPD[i] = (ulong)(&MmPT[i*512])| MF_PRESENT | MF_READWRITE;
}
for (volatile ulong i = NB_4K; i < 512 * RAM_MAX; i++) {
// ENOMEM like
if ((ulong)(i* UPAGESIZE) > (ulong)phRamSize) {
break;
}
MmPD[i] = 0;
MmPD[i] = ((ulong)(i* UPAGESIZE)) | MF_PRESENT | MF_READWRITE | MF_HUGE;
}
for (volatile int i = 0; i < RAM_MAX; i++) {
MmPDP[i] = (ulong)(&MmPD[i*512])| MF_PRESENT | MF_READWRITE;
}
MmPML4[0] = (ulong)(&MmPDP[0])| MF_PRESENT | MF_READWRITE;
MmLoadPML4((void *)MmPML4);
MmEnableWriteProtect();
DebugLog("\tPage RO from %p to %p\n", (ulong)&_text, (ulong)&_text_end);
DebugLog("\tPage RO from %p to %p\n", (ulong)&_rodata, (ulong)&_rodata_end);
//DebugLog("\tPaging tables initialized at %p, %p\n", &MmPD, &MmPT);
//DebugLog("\tStack Guards at %p, %p\n", MmStackGuards[0], MmStackGuards[1]);
MmLoadPML4((void *)MmPageMapLevel4);
//MmEnableWriteProtect();
DebugLog("\tPage table size : %u MB\n", (lastDirectoryAddr - firstDirectoryAddr)/MB);
}
// Returns the rank of the Stack Guards
@ -131,12 +174,6 @@ void *MmGetStackGuards(char rank)
return (void *)MmStackGuards[(int)rank];
}
// Returns an address corresponding to the PT rank
void *MmTranslateKPageToAddr(void *rank)
{
return (void *)MmPT[(ulong)rank];
}
//
// Page fault handler
//
@ -144,10 +181,10 @@ static void PagingHandler(ISRFrame_t *regs)
{
ulong StackGuardOne = (ulong)MmGetStackGuards(0);
ulong StackGuardTwo = (ulong)MmGetStackGuards(1);
if ((regs->cr2 >= StackGuardOne) && (regs->cr2 <= StackGuardOne + 4*KB) && (regs->rsp <= regs->cr2)) {
if ((regs->cr2 >= StackGuardOne) && (regs->cr2 <= StackGuardOne + KPAGESIZE) && (regs->rsp <= regs->cr2)) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Underflow\n\n"
" Double Fault Error code : %#x (%b)\n"
" Page Fault Error code : %#x (%b)\n"
" Stack Guard bypassed : %#x",
VGA_COLOR_LIGHT_RED,
@ -155,10 +192,10 @@ static void PagingHandler(ISRFrame_t *regs)
regs->ErrorCode,
StackGuardOne
);
} else if ((regs->cr2 >= StackGuardTwo) && (regs->cr2 <= StackGuardTwo + 4*KB) && (regs->rsp >= regs->cr2)) {
} else if ((regs->cr2 >= StackGuardTwo) && (regs->cr2 <= StackGuardTwo + KPAGESIZE) && (regs->rsp >= regs->cr2)) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Irrecoverable Kernel Stack Overflow\n\n"
" Double Fault Error code : %#x (%b)\n"
" Page Fault Error code : %#x (%b)\n"
" Stack Guard bypassed : %#x",
VGA_COLOR_LIGHT_RED,
@ -166,13 +203,34 @@ static void PagingHandler(ISRFrame_t *regs)
regs->ErrorCode,
StackGuardTwo
);
} else {
//XXX page fault
bprintf(BStdOut, "\n\n%CPANIC\n[ISR 0x%x] Irrecoverable Kernel Page Fault at %p\n\n"
" Error code : 0x%x (%b)",
} else if (regs->cr2 == 0) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Null vector exception !\n\n"
" Page Fault Error code : %#x (%b)\n",
VGA_COLOR_LIGHT_RED,
regs->intNo,
regs->ErrorCode,
regs->ErrorCode
);
} else if (regs->cr2 >= MmVirtLastAddress || regs->cr2 <= 0) {
bprintf(BStdOut,
"\n\n%CPANIC\n[ISR 0x8] Out of bound of the address space at %p !\n\n"
" End of the address space : %p\n"
" Page Fault Error code : %#x (%b)\n",
VGA_COLOR_LIGHT_RED,
regs->cr2,
MmVirtLastAddress,
regs->ErrorCode,
regs->ErrorCode
);
} else {
//XXX page fault
bprintf(BStdOut, "\n\n%CPANICC\n[ISR 0x8] Irrecoverable Kernel Page Fault at %p\n\n"
" Error code : 0x%x (%b)",
VGA_COLOR_LIGHT_RED,
regs->cr2,
regs->ErrorCode,
regs->ErrorCode

2
kaleid/kernel/sh/musage.c
View File

@ -40,7 +40,7 @@ error_t CmdMemUsage(int argc, char **argv, char *cmdline)
ulong flags = KePauseIRQs();
heap_start = (size_t)_heap_start;
heap_end = (size_t)_heap_end;
heap_end = (size_t)_heap_start;
heap_max = _heap_max;
KeRestoreIRQs(flags);

5
kaleid/kernel/sh/shell.c
View File

@ -126,9 +126,8 @@ void ShStartShell(void)
default:
while (IoGetScroll() > 0) {
IoScrollDown();
}
IoSetScroll(1);
IoScrollDown();
*bufptr++ = (char)ch;

6
kaleid/kernel/sh/testcmds.c
View File

@ -191,7 +191,11 @@ error_t CmdHelpTest(int argc, char **argv, char *cmdline)
error_t CmdPF(int argc, char **argv, char *cmdline)
{
ulong *address = (ulong*)(ulong)atoi(argv[1]);
ulong *address = (ulong*)(ulong)atoul(argv[1]);
if (!address) {
address = (ulong *)0x12fdc3000 - 1 ;
}
KernLog("Provoking Page Fault at %#x\n", address);