#include <mm_virt.h>
#include <threads_int.h>
#include <proc.h>
+#include <hal_proc.h>
// === CONSTANTS ===
#define PHYS_BITS 52 // TODO: Move out
void MM_int_ClonePageEnt( Uint64 *Ent, void *NextLevel, tVAddr Addr, int bTable );
int MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
void MM_int_DumpTablesEnt(tVAddr RangeStart, size_t Length, tPAddr Expected);
-void MM_DumpTables(tVAddr Start, tVAddr End);
+//void MM_DumpTables(tVAddr Start, tVAddr End);
int MM_GetPageEntryPtr(tVAddr Addr, BOOL bTemp, BOOL bAllocate, BOOL bLargePage, tPAddr **Pointer);
int MM_MapEx(tVAddr VAddr, tPAddr PAddr, BOOL bTemp, BOOL bLarge);
// int MM_Map(tVAddr VAddr, tPAddr PAddr);
void MM_Unmap(tVAddr VAddr);
void MM_int_ClearTableLevel(tVAddr VAddr, int LevelBits, int MaxEnts);
-void MM_ClearUser(void);
+//void MM_ClearUser(void);
int MM_GetPageEntry(tVAddr Addr, tPAddr *Phys, Uint *Flags);
// === GLOBALS ===
// === CODE ===
void MM_InitVirt(void)
{
- Log_Debug("MMVirt", "&PAGEMAPLVL4(0) = %p", &PAGEMAPLVL4(0));
+// Log_Debug("MMVirt", "&PAGEMAPLVL4(0) = %p", &PAGEMAPLVL4(0));
// MM_DumpTables(0, -1L);
}
void MM_int_ClonePageEnt( Uint64 *Ent, void *NextLevel, tVAddr Addr, int bTable )
{
tPAddr curpage = *Ent & PADDR_MASK;
+ int bCopied = 0;
+
if( MM_GetRefCount( curpage ) <= 0 ) {
Log_KernelPanic("MMVirt", "Page %P still marked COW, but unreferenced", curpage);
}
{
*Ent &= ~PF_COW;
*Ent |= PF_PRESENT|PF_WRITE;
+ Log_Debug("MMVirt", "COW ent at %p (%p) only %P", Ent, NextLevel, curpage);
}
else
{
memcpy( tmp, NextLevel, 0x1000 );
MM_FreeTemp( (tVAddr)tmp );
-// Log_Debug("MMVirt", "COW ent at %p (%p) from %P to %P", Ent, NextLevel, curpage, paddr);
+ Log_Debug("MMVirt", "COW ent at %p (%p) from %P to %P", Ent, NextLevel, curpage, paddr);
MM_DerefPhys( curpage );
*Ent &= PF_USER;
*Ent |= paddr|PF_PRESENT|PF_WRITE;
+
+ bCopied = 1;
}
INVLPG( (tVAddr)NextLevel );
- // Mark COW on pages
+ // Mark COW on contents if it's a PDPT, Dir or Table
if(bTable)
{
Uint64 *dp = NextLevel;
int i;
for( i = 0; i < 512; i ++ )
{
- if( !(dp[i] & PF_PRESENT) ) continue;
- MM_RefPhys( dp[i] & PADDR_MASK );
+ if( !(dp[i] & PF_PRESENT) )
+ continue;
+
+ if( bCopied )
+ MM_RefPhys( dp[i] & PADDR_MASK );
if( dp[i] & PF_WRITE ) {
dp[i] &= ~PF_WRITE;
dp[i] |= PF_COW;
*/
int MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs)
{
+// Log_Debug("MMVirt", "Addr = %p, ErrorCode = %x", Addr, ErrorCode);
+
+ // Catch reserved bits first
+ if( ErrorCode & 0x8 )
+ {
+ Log_Warning("MMVirt", "Reserved bits trashed!");
+ Log_Warning("MMVirt", "PML4 Ent = %P", PAGEMAPLVL4(Addr>>39));
+ if( !(PAGEMAPLVL4(Addr>>39) & PF_PRESENT) ) goto print_done;
+ Log_Warning("MMVirt", "PDP Ent = %P", PAGEDIRPTR(Addr>>30));
+ if( !(PAGEDIRPTR(Addr>>30) & PF_PRESENT) ) goto print_done;
+ Log_Warning("MMVirt", "PDir Ent = %P", PAGEDIR(Addr>>21));
+ if( !(PAGEDIR(Addr>>21) & PF_PRESENT) ) goto print_done;
+ Log_Warning("MMVirt", "PTable Ent = %P", PAGETABLE(Addr>>12));
+ if( !(PAGETABLE(Addr>>12) & PF_PRESENT) ) goto print_done;
+ print_done:
+
+ for(;;);
+ }
+
// TODO: Implement Copy-on-Write
#if 1
if( PAGEMAPLVL4(Addr>>39) & PF_PRESENT
Warning("User Pagefault: Instruction at %04x:%p accessed %p",
Regs->CS, Regs->RIP, Addr);
__asm__ __volatile__ ("sti"); // Restart IRQs
+ Error_Backtrace(Regs->RIP, Regs->RBP);
Threads_SegFault(Addr);
return 0;
}
void MM_int_DumpTablesEnt(tVAddr RangeStart, size_t Length, tPAddr Expected)
{
#define CANOICAL(addr) ((addr)&0x800000000000?(addr)|0xFFFF000000000000:(addr))
- LogF("%6llx %6llx %6llx %016llx => ",
- MM_GetPhysAddr( (tVAddr)&PAGEDIRPTR(RangeStart>>30) ),
- MM_GetPhysAddr( (tVAddr)&PAGEDIR(RangeStart>>21) ),
- MM_GetPhysAddr( (tVAddr)&PAGETABLE(RangeStart>>12) ),
- CANOICAL(RangeStart)
- );
+ LogF("%016llx => ", CANOICAL(RangeStart));
+// LogF("%6llx %6llx %6llx %016llx => ",
+// MM_GetPhysAddr( (tVAddr)&PAGEDIRPTR(RangeStart>>30) ),
+// MM_GetPhysAddr( (tVAddr)&PAGEDIR(RangeStart>>21) ),
+// MM_GetPhysAddr( (tVAddr)&PAGETABLE(RangeStart>>12) ),
+// CANOICAL(RangeStart)
+// );
if( gMM_ZeroPage && (PAGETABLE(RangeStart>>12) & PADDR_MASK) == gMM_ZeroPage )
LogF("%13s", "zero" );
else
tPAddr *ent;
int rv;
- ENTER("xVAddr xPAddr", VAddr, PAddr);
+ ENTER("pVAddr PPAddr", VAddr, PAddr);
// Get page pointer (Allow allocating)
rv = MM_GetPageEntryPtr(VAddr, bTemp, 1, bLarge, &ent);
return ret;
}
+/**
+ * \brief Check if the provided buffer is valid
+ * \return Boolean valid
+ */
+int MM_IsValidBuffer(tVAddr Addr, size_t Size)
+{
+ int bIsUser;
+ Uint64 pml4, pdp, dir, tab;
+
+ Size += Addr & (PAGE_SIZE-1);
+ Addr &= ~(PAGE_SIZE-1);
+ Addr &= ((1UL << 48)-1); // Clap to address space
+
+ pml4 = Addr >> 39;
+ pdp = Addr >> 30;
+ dir = Addr >> 21;
+ tab = Addr >> 12;
+
+ if( !(PAGEMAPLVL4(pml4) & 1) ) return 0;
+ if( !(PAGEDIRPTR(pdp) & 1) ) return 0;
+ if( !(PAGEDIR(dir) & 1) ) return 0;
+ if( !(PAGETABLE(tab) & 1) ) return 0;
+
+ bIsUser = !!(PAGETABLE(tab) & PF_USER);
+
+ while( Size >= PAGE_SIZE )
+ {
+ if( (tab & 511) == 0 )
+ {
+ dir ++;
+ if( ((dir >> 9) & 511) == 0 )
+ {
+ pdp ++;
+ if( ((pdp >> 18) & 511) == 0 )
+ {
+ pml4 ++;
+ if( !(PAGEMAPLVL4(pml4) & 1) ) return 0;
+ }
+ if( !(PAGEDIRPTR(pdp) & 1) ) return 0;
+ }
+ if( !(PAGEDIR(dir) & 1) ) return 0;
+ }
+
+ if( !(PAGETABLE(tab) & 1) ) return 0;
+ if( bIsUser && !(PAGETABLE(tab) & PF_USER) ) return 0;
+
+ tab ++;
+ Size -= PAGE_SIZE;
+ }
+ return 1;
+}
+
// --- Hardware Mappings ---
/**
* \brief Map a range of hardware pages
}
if( num >= 0 ) continue;
+// Log_Debug("MMVirt", "Mapping %i pages to %p (base %P)", Number, ret-Number*0x1000, PAddr);
+
PAddr += 0x1000 * Number;
while( Number -- )
return ret;
}
- Log_KernelPanic("MM", "TODO: Implement MM_MapHWPages");
+ Log_Error("MM", "MM_MapHWPages - No space for %i pages", Number);
return 0;
}
{
// Skip addresses:
// 320 0xFFFFA.... - Kernel Stacks
- if( i == 320 ) continue;
+ if( i == MM_KSTACK_BASE>>39 ) continue;
// 509 0xFFFFFE0.. - Fractal mapping
- if( i == 508 ) continue;
+ if( i == MM_FRACTAL_BASE>>39 ) continue;
// 510 0xFFFFFE8.. - Temp fractal mapping
- if( i == 509 ) continue;
+ if( i == MM_TMPFRAC_BASE>>39 ) continue;
TMPMAPLVL4(i) = PAGEMAPLVL4(i);
if( TMPMAPLVL4(i) & 1 )
MM_RefPhys( TMPMAPLVL4(i) & PADDR_MASK );
}
+
+ // Mark Per-Process data as COW
+ TMPMAPLVL4(MM_PPD_BASE>>39) |= PF_COW;
+ TMPMAPLVL4(MM_PPD_BASE>>39) &= ~PF_WRITE;
// #5 Set fractal mapping
- TMPMAPLVL4(508) = ret | 3; // Main
- TMPMAPLVL4(509) = 0; // Temp
+ TMPMAPLVL4(MM_FRACTAL_BASE>>39) = ret | 3; // Main
+ TMPMAPLVL4(MM_TMPFRAC_BASE>>39) = 0; // Temp
// #6 Create kernel stack
// tThread->KernelStack is the top
// There is 1 guard page below the stack
kstackbase = Proc_GetCurThread()->KernelStack - KERNEL_STACK_SIZE;
- Log("MM_Clone: kstackbase = %p", kstackbase);
-
+ // Clone stack
TMPMAPLVL4(MM_KSTACK_BASE >> PML4_SHIFT) = 0;
for( i = 1; i < KERNEL_STACK_SIZE/0x1000; i ++ )
{
tVAddr tmpmapping;
MM_MapEx(kstackbase+i*0x1000, phys, 1, 0);
- Log_Debug("MM", "MM_Clone: Cloning stack page %p from %P to %P",
- kstackbase+i*0x1000, MM_GetPhysAddr( kstackbase+i*0x1000 ), phys
- );
tmpmapping = MM_MapTemp(phys);
if( MM_GetPhysAddr( kstackbase+i*0x1000 ) )
memcpy((void*)tmpmapping, (void*)(kstackbase+i*0x1000), 0x1000);
Uint64 * const table_bases[] = {&PAGETABLE(0), &PAGEDIR(0), &PAGEDIRPTR(0), &PAGEMAPLVL4(0)};
Uint64 *table = table_bases[(LevelBits-12)/9] + (VAddr >> LevelBits);
int i;
- Log("MM_int_ClearTableLevel: (VAddr=%p, LevelBits=%i, MaxEnts=%i)", VAddr, LevelBits, MaxEnts);
+// Log("MM_int_ClearTableLevel: (VAddr=%p, LevelBits=%i, MaxEnts=%i)", VAddr, LevelBits, MaxEnts);
for( i = 0; i < MaxEnts; i ++ )
{
// Skip non-present tables
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