#define PF_WRITE 0x2
#define PF_USER 0x4
#define PF_COW 0x200
-#define PF_PAGED 0x400
+#define PF_NOPAGE 0x400
#define INVLPG(addr) __asm__ __volatile__ ("invlpg (%0)"::"r"(addr))
void MM_InstallVirtual(void);
void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
void MM_DumpTables(tVAddr Start, tVAddr End);
+tVAddr MM_ClearUser(void);
tPAddr MM_DuplicatePage(tVAddr VAddr);
// === GLOBALS ===
);
Warning("User Pagefault: Instruction at %04x:%08x accessed %p", Regs->cs, Regs->eip, Addr);
__asm__ __volatile__ ("sti"); // Restart IRQs
+ #if 1
+ Error_Backtrace(Regs->eip, Regs->ebp);
+ #endif
Threads_SegFault(Addr);
return ;
}
rangeStart, curPos - 1,
gaPageTable[rangeStart>>12] & ~0xFFF,
(expected & ~0xFFF) - 1,
- (expected & PF_PAGED ? "p" : "-"),
+ (expected & PF_NOPAGE ? "P" : "-"),
(expected & PF_COW ? "C" : "-"),
(expected & PF_USER ? "U" : "-"),
(expected & PF_WRITE ? "W" : "-")
rangeStart, curPos - 1,
gaPageTable[rangeStart>>12] & ~0xFFF,
(expected & ~0xFFF) - 1,
- (expected & PF_PAGED ? "p" : "-"),
+ (expected & PF_NOPAGE ? "p" : "-"),
(expected & PF_COW ? "C" : "-"),
(expected & PF_USER ? "U" : "-"),
(expected & PF_WRITE ? "W" : "-")
//LOG("Allocated Directory (%x)", *gpTmpCR3);
memsetd( gaTmpDir, 0, 1024 );
- // Copy Tables
- for( i = 0; i < 768; i ++)
- {
- // Check if table is allocated
- if( !(gaPageDir[i] & PF_PRESENT) ) {
- gaTmpDir[i] = 0;
- page += 1024;
- continue;
- }
-
- // Allocate new table
- gaTmpDir[i] = MM_AllocPhys() | (gaPageDir[i] & 7);
- INVLPG( &gaTmpTable[page] );
- // Fill
- for( j = 0; j < 1024; j ++, page++ )
+ if( Threads_GetPID() != 0 )
+ {
+ // Copy Tables
+ for( i = 0; i < 768; i ++)
{
- if( !(gaPageTable[page] & PF_PRESENT) ) {
- gaTmpTable[page] = 0;
+ // Check if table is allocated
+ if( !(gaPageDir[i] & PF_PRESENT) ) {
+ gaTmpDir[i] = 0;
+ page += 1024;
continue;
}
- // Refrence old page
- MM_RefPhys( gaPageTable[page] & ~0xFFF );
- // Add to new table
- if(gaPageTable[page] & PF_WRITE) {
- gaTmpTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
- gaPageTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
- INVLPG( page << 12 );
+ // Allocate new table
+ gaTmpDir[i] = MM_AllocPhys() | (gaPageDir[i] & 7);
+ INVLPG( &gaTmpTable[page] );
+ // Fill
+ for( j = 0; j < 1024; j ++, page++ )
+ {
+ if( !(gaPageTable[page] & PF_PRESENT) ) {
+ gaTmpTable[page] = 0;
+ continue;
+ }
+
+ // Refrence old page
+ MM_RefPhys( gaPageTable[page] & ~0xFFF );
+ // Add to new table
+ if(gaPageTable[page] & PF_WRITE) {
+ gaTmpTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
+ gaPageTable[page] = (gaPageTable[page] & ~PF_WRITE) | PF_COW;
+ INVLPG( page << 12 );
+ }
+ else
+ gaTmpTable[page] = gaPageTable[page];
}
- else
- gaTmpTable[page] = gaPageTable[page];
}
}
Uint i;
for(base = KERNEL_STACKS; base < KERNEL_STACKS_END; base += KERNEL_STACK_SIZE)
{
+ // Check if space is free
if(MM_GetPhysAddr(base) != 0) continue;
- for(i = 0; i < KERNEL_STACK_SIZE; i += 0x1000) {
- MM_Allocate(base+i);
+ // Allocate
+ //for(i = KERNEL_STACK_SIZE; i -= 0x1000 ; )
+ for(i = 0; i < KERNEL_STACK_SIZE; i += 0x1000 )
+ {
+ if( MM_Allocate(base+i) == 0 )
+ {
+ // On error, print a warning and return error
+ Warning("MM_NewKStack - Out of memory");
+ // - Clean up
+ //for( i += 0x1000 ; i < KERNEL_STACK_SIZE; i += 0x1000 )
+ // MM_Deallocate(base+i);
+ return 0;
+ }
}
+ // Success
Log("MM_NewKStack - Allocated %p", base + KERNEL_STACK_SIZE);
return base+KERNEL_STACK_SIZE;
}
- Warning("MM_NewKStack - No address space left\n");
+ // No stacks left
+ Warning("MM_NewKStack - No address space left");
return 0;
}
__asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
__asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
+ // TODO: Thread safety
// Find a free worker stack address
for(base = giLastUsedWorker; base < NUM_WORKER_STACKS; base++)
{
// Mapping Time!
for( addr = 0; addr < WORKER_STACK_SIZE; addr += 0x1000 )
+ //for( addr = WORKER_STACK_SIZE; addr; addr -= 0x1000 )
{
pages[ addr >> 12 ] = MM_AllocPhys();
gaTmpTable[ (base + addr) >> 12 ] = pages[addr>>12] | 3;