*
* Virtual Memory Manager
*/
+#define DEBUG 0
#include <acess.h>
#include <mm_virt.h>
+#include <threads_int.h>
+#include <proc.h>
// === CONSTANTS ===
+#define PHYS_BITS 52 // TODO: Move out
+
#define PML4_SHIFT 39
#define PDP_SHIFT 30
#define PDIR_SHIFT 21
#define PTAB_SHIFT 12
#define PADDR_MASK 0x7FFFFFFF##FFFFF000
+#define PAGE_MASK (((Uint)1 << 36)-1)
+#define TABLE_MASK (((Uint)1 << 27)-1)
+#define PDP_MASK (((Uint)1 << 18)-1)
+#define PML4_MASK (((Uint)1 << 9)-1)
-#define PF_PRESENT 0x1
-#define PF_WRITE 0x2
-#define PF_USER 0x4
+#define PF_PRESENT 0x001
+#define PF_WRITE 0x002
+#define PF_USER 0x004
+#define PF_LARGE 0x000
#define PF_COW 0x200
#define PF_PAGED 0x400
#define PF_NX 0x80000000##00000000
// === MACROS ===
-#define PAGETABLE(idx) (*((tPAddr*)MM_FRACTAL_BASE+(idx)))
-#define PAGEDIR(idx) PAGETABLE((MM_FRACTAL_BASE>>12)+((idx)&0x7FFFFFF))
-#define PAGEDIRPTR(idx) PAGEDIR((MM_FRACTAL_BASE>>21)+((idx)&0x3FFFF))
-#define PAGEMAPLVL4(idx) PAGEDIRPTR((MM_FRACTAL_BASE>>30)+((idx)&0x1FF))
+#define PAGETABLE(idx) (*((tPAddr*)MM_FRACTAL_BASE+((idx)&PAGE_MASK)))
+#define PAGEDIR(idx) PAGETABLE((MM_FRACTAL_BASE>>12)+((idx)&TABLE_MASK))
+#define PAGEDIRPTR(idx) PAGEDIR((MM_FRACTAL_BASE>>21)+((idx)&PDP_MASK))
+#define PAGEMAPLVL4(idx) PAGEDIRPTR((MM_FRACTAL_BASE>>30)+((idx)&PML4_MASK))
+
+#define TMPCR3() PAGEMAPLVL4(MM_TMPFRAC_BASE>>39)
+#define TMPTABLE(idx) (*((tPAddr*)MM_TMPFRAC_BASE+((idx)&PAGE_MASK)))
+#define TMPDIR(idx) PAGETABLE((MM_TMPFRAC_BASE>>12)+((idx)&TABLE_MASK))
+#define TMPDIRPTR(idx) PAGEDIR((MM_TMPFRAC_BASE>>21)+((idx)&PDP_MASK))
+#define TMPMAPLVL4(idx) PAGEDIRPTR((MM_TMPFRAC_BASE>>30)+((idx)&PML4_MASK))
+
+#define INVLPG(__addr) __asm__ __volatile__ ("invlpg (%0)"::"r"(__addr))
+#define INVLPG_ALL() __asm__ __volatile__ ("mov %cr3,%rax;\n\tmov %rax,%cr3;")
+#define INVLPG_GLOBAL() __asm__ __volatile__ ("mov %cr4,%rax;\n\txorl $0x80, %eax;\n\tmov %rax,%cr4;\n\txorl $0x80, %eax;\n\tmov %rax,%cr4")
+
+// === CONSTS ===
+//tPAddr * const gaPageTable = MM_FRACTAL_BASE;
+
+// === IMPORTS ===
+extern void Error_Backtrace(Uint IP, Uint BP);
+extern tPAddr gInitialPML4[512];
+
+// === PROTOTYPES ===
+void MM_InitVirt(void);
+//void MM_FinishVirtualInit(void);
+void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
+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_ClearUser(void);
+ int MM_GetPageEntry(tVAddr Addr, tPAddr *Phys, Uint *Flags);
// === GLOBALS ===
+tMutex glMM_TempFractalLock;
// === CODE ===
void MM_InitVirt(void)
{
-
+ MM_DumpTables(0, -1L);
}
void MM_FinishVirtualInit(void)
{
+ PAGEMAPLVL4(0) = 0;
+}
+
+/**
+ * \brief Called on a page fault
+ */
+void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs)
+{
+ // TODO: Implement Copy-on-Write
+ #if 0
+ if( gaPageDir [Addr>>22] & PF_PRESENT
+ && gaPageTable[Addr>>12] & PF_PRESENT
+ && gaPageTable[Addr>>12] & PF_COW )
+ {
+ tPAddr paddr;
+ if(MM_GetRefCount( gaPageTable[Addr>>12] & PADDR_MASK ) == 1)
+ {
+ gaPageTable[Addr>>12] &= ~PF_COW;
+ gaPageTable[Addr>>12] |= PF_PRESENT|PF_WRITE;
+ }
+ else
+ {
+ //Log("MM_PageFault: COW - MM_DuplicatePage(0x%x)", Addr);
+ paddr = MM_DuplicatePage( Addr );
+ MM_DerefPhys( gaPageTable[Addr>>12] & PADDR_MASK );
+ gaPageTable[Addr>>12] &= PF_USER;
+ gaPageTable[Addr>>12] |= paddr|PF_PRESENT|PF_WRITE;
+ }
+
+ INVLPG( Addr & ~0xFFF );
+ return;
+ }
+ #endif
+
+ // If it was a user, tell the thread handler
+ if(ErrorCode & 4) {
+ Warning("%s %s %s memory%s",
+ (ErrorCode&4?"User":"Kernel"),
+ (ErrorCode&2?"write to":"read from"),
+ (ErrorCode&1?"bad/locked":"non-present"),
+ (ErrorCode&16?" (Instruction Fetch)":"")
+ );
+ Warning("User Pagefault: Instruction at %04x:%08x accessed %p",
+ Regs->CS, Regs->RIP, Addr);
+ __asm__ __volatile__ ("sti"); // Restart IRQs
+// Threads_SegFault(Addr);
+ return ;
+ }
+
+ // Kernel #PF
+ Debug_KernelPanic();
+ // -- Check Error Code --
+ if(ErrorCode & 8)
+ Warning("Reserved Bits Trashed!");
+ else
+ {
+ Warning("%s %s %s memory%s",
+ (ErrorCode&4?"User":"Kernel"),
+ (ErrorCode&2?"write to":"read from"),
+ (ErrorCode&1?"bad/locked":"non-present"),
+ (ErrorCode&16?" (Instruction Fetch)":"")
+ );
+ }
+ Log("Code at %p accessed %p", Regs->RIP, Addr);
+ // Print Stack Backtrace
+ Error_Backtrace(Regs->RIP, Regs->RBP);
+
+ MM_DumpTables(0, -1);
+
+ __asm__ __volatile__ ("cli");
+ for( ;; )
+ HALT();
}
/**
- * \brief Map a physical page to a virtual one
+ * \brief Dumps the layout of the page tables
*/
-int MM_Map(tVAddr VAddr, tPAddr PAddr)
+void MM_DumpTables(tVAddr Start, tVAddr End)
{
- tPAddr tmp;
+ #define CANOICAL(addr) ((addr)&0x800000000000?(addr)|0xFFFF000000000000:(addr))
+ const tPAddr CHANGEABLE_BITS = 0xFF8;
+ const tPAddr MASK = ~CHANGEABLE_BITS; // Physical address and access bits
+ tVAddr rangeStart = 0;
+ tPAddr expected = CHANGEABLE_BITS; // CHANGEABLE_BITS is used because it's not a vaild value
+ tVAddr curPos;
+ Uint page;
- // Check PML4
- if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
+ Log("Table Entries: (%p to %p)", Start, End);
+
+ End &= (1L << 48) - 1;
+
+ Start >>= 12; End >>= 12;
+
+ for(page = Start, curPos = Start<<12;
+ page < End;
+ curPos += 0x1000, page++)
{
- tmp = MM_AllocPhys();
- if(!tmp) return 0;
- PAGEMAPLVL4(VAddr >> 39) = tmp | 3;
- memset( &PAGEDIRPTR( (VAddr>>39)<<9 ), 0, 4096 );
+ if( curPos == 0x800000000000L )
+ curPos = 0xFFFF800000000000L;
+
+ //Debug("&PAGEMAPLVL4(%i page>>27) = %p", page>>27, &PAGEMAPLVL4(page>>27));
+ //Debug("&PAGEDIRPTR(%i page>>18) = %p", page>>18, &PAGEDIRPTR(page>>18));
+ //Debug("&PAGEDIR(%i page>>9) = %p", page>>9, &PAGEDIR(page>>9));
+ //Debug("&PAGETABLE(%i page) = %p", page, &PAGETABLE(page));
+
+ // End of a range
+ if(
+ !(PAGEMAPLVL4(page>>27) & PF_PRESENT)
+ || !(PAGEDIRPTR(page>>18) & PF_PRESENT)
+ || !(PAGEDIR(page>>9) & PF_PRESENT)
+ || !(PAGETABLE(page) & PF_PRESENT)
+ || (PAGETABLE(page) & MASK) != expected)
+ {
+ if(expected != CHANGEABLE_BITS) {
+ Log("%016llx => %013llx : 0x%6llx (%c%c%c%c)",
+ CANOICAL(rangeStart),
+ PAGETABLE(rangeStart>>12) & PADDR_MASK,
+ curPos - rangeStart,
+ (expected & PF_PAGED ? 'p' : '-'),
+ (expected & PF_COW ? 'C' : '-'),
+ (expected & PF_USER ? 'U' : '-'),
+ (expected & PF_WRITE ? 'W' : '-')
+ );
+ expected = CHANGEABLE_BITS;
+ }
+ if( !(PAGEMAPLVL4(page>>27) & PF_PRESENT) ) {
+ page += (1 << 27) - 1;
+ curPos += (1L << 39) - 0x1000;
+ //Debug("pml4 ent unset (page = 0x%x now)", page);
+ continue;
+ }
+ if( !(PAGEDIRPTR(page>>18) & PF_PRESENT) ) {
+ page += (1 << 18) - 1;
+ curPos += (1L << 30) - 0x1000;
+ //Debug("pdp ent unset (page = 0x%x now)", page);
+ continue;
+ }
+ if( !(PAGEDIR(page>>9) & PF_PRESENT) ) {
+ page += (1 << 9) - 1;
+ curPos += (1L << 21) - 0x1000;
+ //Debug("pd ent unset (page = 0x%x now)", page);
+ continue;
+ }
+ if( !(PAGETABLE(page) & PF_PRESENT) ) continue;
+
+ expected = (PAGETABLE(page) & MASK);
+ rangeStart = curPos;
+ }
+ if(expected != CHANGEABLE_BITS)
+ expected += 0x1000;
}
- // Check PDP
- if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
+ if(expected != CHANGEABLE_BITS) {
+ Log("%016llx => %013llx : 0x%6llx (%c%c%c%c)",
+ CANOICAL(rangeStart),
+ PAGETABLE(rangeStart>>12) & PADDR_MASK,
+ curPos - rangeStart,
+ (expected & PF_PAGED ? 'p' : '-'),
+ (expected & PF_COW ? 'C' : '-'),
+ (expected & PF_USER ? 'U' : '-'),
+ (expected & PF_WRITE ? 'W' : '-')
+ );
+ expected = 0;
+ }
+ #undef CANOICAL
+}
+
+/**
+ * \brief Get a pointer to a page entry
+ * \param Addr Virtual Address
+ * \param bTemp Use the Temporary fractal mapping
+ * \param bAllocate Allocate entries
+ * \param bLargePage Request a large page
+ * \param Pointer Location to place the calculated pointer
+ * \return Page size, or -ve on error
+ */
+int MM_GetPageEntryPtr(tVAddr Addr, BOOL bTemp, BOOL bAllocate, BOOL bLargePage, tPAddr **Pointer)
+{
+ tPAddr *pmlevels[4];
+ tPAddr tmp;
+ const int ADDR_SIZES[] = {39, 30, 21, 12};
+ const int nADDR_SIZES = sizeof(ADDR_SIZES)/sizeof(ADDR_SIZES[0]);
+ int i;
+
+ if( bTemp )
+ {
+ pmlevels[3] = &TMPTABLE(0); // Page Table
+ pmlevels[2] = &TMPDIR(0); // PDIR
+ pmlevels[1] = &TMPDIRPTR(0); // PDPT
+ pmlevels[0] = &TMPMAPLVL4(0); // PML4
+ }
+ else
{
- tmp = MM_AllocPhys();
- if(!tmp) return 0;
- PAGEDIRPTR(VAddr >> 30) = tmp | 3;
- memset( &PAGEDIR( (VAddr>>30)<<9 ), 0, 4096 );
+ pmlevels[3] = (void*)MM_FRACTAL_BASE; // Page Table
+ pmlevels[2] = &pmlevels[3][(MM_FRACTAL_BASE>>12)&PAGE_MASK]; // PDIR
+ pmlevels[1] = &pmlevels[2][(MM_FRACTAL_BASE>>21)&TABLE_MASK]; // PDPT
+ pmlevels[0] = &pmlevels[1][(MM_FRACTAL_BASE>>30)&PDP_MASK]; // PML4
}
- // Check Page Dir
- if( !(PAGEDIR(VAddr >> 21) & 1) )
+ // Mask address
+ Addr &= (1ULL << 48)-1;
+
+ for( i = 0; i < nADDR_SIZES-1; i ++ )
{
- tmp = MM_AllocPhys();
- if(!tmp) return 0;
- PAGEDIR(VAddr >> 21) = tmp | 3;
- memset( &PAGETABLE( (VAddr>>21)<<9 ), 0, 4096 );
+// INVLPG( &pmlevels[i][ (Addr >> ADDR_SIZES[i]) &
+
+ // Check for a large page
+ if( (Addr & ((1ULL << ADDR_SIZES[i])-1)) == 0 && bLargePage )
+ {
+ if(Pointer) *Pointer = &pmlevels[i][Addr >> ADDR_SIZES[i]];
+ return ADDR_SIZES[i];
+ }
+ // Allocate an entry if required
+ if( !(pmlevels[i][Addr >> ADDR_SIZES[i]] & 1) )
+ {
+ if( !bAllocate ) return -4; // If allocation is not requested, error
+ tmp = MM_AllocPhys();
+ if(!tmp) return -2;
+ pmlevels[i][Addr >> ADDR_SIZES[i]] = tmp | 3;
+ INVLPG( &pmlevels[i+1][ (Addr>>ADDR_SIZES[i])*512 ] );
+ memset( &pmlevels[i+1][ (Addr>>ADDR_SIZES[i])*512 ], 0, 0x1000 );
+ }
+ // Catch large pages
+ else if( pmlevels[i][Addr >> ADDR_SIZES[i]] & PF_LARGE )
+ {
+ // Alignment
+ if( (Addr & ((1ULL << ADDR_SIZES[i])-1)) != 0 ) return -3;
+ if(Pointer) *Pointer = &pmlevels[i][Addr >> ADDR_SIZES[i]];
+ return ADDR_SIZES[i]; // Large page warning
+ }
}
- // Check if this virtual address is already mapped
- if( PAGETABLE(VAddr >> 12) & 1 )
- return 0;
+ // And, set the page table entry
+ if(Pointer) *Pointer = &pmlevels[i][Addr >> ADDR_SIZES[i]];
+ return ADDR_SIZES[i];
+}
+
+/**
+ * \brief Map a physical page to a virtual one
+ * \param VAddr Target virtual address
+ * \param PAddr Physical address of page
+ * \param bTemp Use tempoary mappings
+ * \param bLarge Treat as a large page
+ */
+int MM_MapEx(tVAddr VAddr, tPAddr PAddr, BOOL bTemp, BOOL bLarge)
+{
+ tPAddr *ent;
+ int rv;
+
+ ENTER("xVAddr xPAddr", VAddr, PAddr);
- PAGETABLE(VAddr >> 12) = PAddr | 3;
+ // Get page pointer (Allow allocating)
+ rv = MM_GetPageEntryPtr(VAddr, bTemp, 1, bLarge, &ent);
+ if(rv < 0) LEAVE_RET('i', 0);
+ if( *ent & 1 ) LEAVE_RET('i', 0);
+
+ *ent = PAddr | 3;
+
+ INVLPG( VAddr );
+
+ LEAVE('i', 1);
return 1;
}
+/**
+ * \brief Map a physical page to a virtual one
+ * \param VAddr Target virtual address
+ * \param PAddr Physical address of page
+ */
+int MM_Map(tVAddr VAddr, tPAddr PAddr)
+{
+ return MM_MapEx(VAddr, PAddr, 0, 0);
+}
+
/**
* \brief Removed a mapped page
*/
// Check Page Dir
if( !(PAGEDIR(VAddr >> 21) & 1) ) return ;
- PAGETABLE(VAddr >> 12) = 0;
+ PAGETABLE(VAddr >> PTAB_SHIFT) = 0;
+ INVLPG( VAddr );
}
/**
{
tPAddr ret;
- Log("MM_Allocate: (VAddr=%x)", VAddr);
- Log("MM_Allocate: MM_AllocPhys()");
+ ENTER("xVAddr", VAddr);
+
+ // Ensure the tables are allocated before the page (keeps things neat)
+ MM_GetPageEntryPtr(VAddr, 0, 1, 0, NULL);
+
+ // Allocate the page
ret = MM_AllocPhys();
- Log("MM_Allocate: ret = %x", ret);
- if(!ret) return 0;
+ LOG("ret = %x", ret);
+ if(!ret) LEAVE_RET('i', 0);
if( !MM_Map(VAddr, ret) )
{
- Warning("MM_Allocate: Unable to map", ret);
+ Warning("MM_Allocate: Unable to map. Strange, we should have errored earlier");
MM_DerefPhys(ret);
+ LEAVE('i');
return 0;
}
+ LEAVE('X', ret);
return ret;
}
+/**
+ * \brief Deallocate a page at a virtual address
+ */
void MM_Deallocate(tVAddr VAddr)
{
tPAddr phys;
MM_DerefPhys(phys);
}
+/**
+ * \brief Get the page table entry of a virtual address
+ * \param Addr Virtual Address
+ * \param Phys Location to put the physical address
+ * \param Flags Flags on the entry (set to zero if unmapped)
+ * \return Size of the entry (in address bits) - 12 = 4KiB page
+ */
+int MM_GetPageEntry(tVAddr Addr, tPAddr *Phys, Uint *Flags)
+{
+ tPAddr *ptr;
+ int ret;
+
+ if(!Phys || !Flags) return 0;
+
+ ret = MM_GetPageEntryPtr(Addr, 0, 0, 0, &ptr);
+ if( ret < 0 ) return 0;
+
+ *Phys = *ptr & PADDR_MASK;
+ *Flags = *ptr & 0xFFF;
+ return ret;
+}
+
/**
* \brief Get the physical address of a virtual location
*/
tPAddr MM_GetPhysAddr(tVAddr Addr)
{
- if( !(PAGEMAPLVL4(Addr >> 39) & 1) )
- return 0;
- if( !(PAGEDIRPTR(Addr >> 30) & 1) )
- return 0;
- if( !(PAGEDIR(Addr >> 21) & 1) )
- return 0;
- if( !(PAGETABLE(Addr >> 12) & 1) )
- return 0;
+ tPAddr *ptr;
+ int ret;
+
+ ret = MM_GetPageEntryPtr(Addr, 0, 0, 0, &ptr);
+ if( ret < 0 ) return 0;
- return (PAGETABLE(Addr >> 12) & ~0xFFF) | (Addr & 0xFFF);
+ return (*ptr & PADDR_MASK) | (Addr & 0xFFF);
}
/**
void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
{
tPAddr *ent;
+ int rv;
- // Validity Check
- if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
- return ;
- if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
- return ;
- if( !(PAGEDIR(VAddr >> 21) & 1) )
- return ;
- if( !(PAGETABLE(VAddr >> 12) & 1) )
- return ;
+ // Get pointer
+ rv = MM_GetPageEntryPtr(VAddr, 0, 0, 0, &ent);
+ if(rv < 0) return ;
- // Set Flags
- ent = &PAGETABLE(VAddr >> 12);
+ // Ensure the entry is valid
+ if( !(*ent & 1) ) return ;
// Read-Only
if( Mask & MM_PFLAG_RO )
Uint MM_GetFlags(tVAddr VAddr)
{
tPAddr *ent;
- Uint ret = 0;
+ int rv, ret = 0;
- // Validity Check
- if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
- return 0;
- if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
- return 0;
- if( !(PAGEDIR(VAddr >> 21) & 1) )
- return 0;
- if( !(PAGETABLE(VAddr >> 12) & 1) )
- return 0;
+ rv = MM_GetPageEntryPtr(VAddr, 0, 0, 0, &ent);
+ if(rv < 0) return 0;
- // Set Flags
- ent = &PAGETABLE(VAddr >> 12);
+ if( !(*ent & 1) ) return 0;
// Read-Only
if( !(*ent & PF_WRITE) ) ret |= MM_PFLAG_RO;
*/
tVAddr MM_MapHWPages(tPAddr PAddr, Uint Number)
{
+ tVAddr ret;
+ int num;
+
+ //TODO: Add speedups (memory of first possible free)
+ for( ret = MM_HWMAP_BASE; ret < MM_HWMAP_TOP; ret += 0x1000 )
+ {
+ for( num = Number; num -- && ret < MM_HWMAP_TOP; ret += 0x1000 )
+ {
+ if( MM_GetPhysAddr(ret) != 0 ) break;
+ }
+ if( num >= 0 ) continue;
+
+ PAddr += 0x1000 * Number;
+
+ while( Number -- )
+ {
+ ret -= 0x1000;
+ PAddr -= 0x1000;
+ MM_Map(ret, PAddr);
+ }
+
+ return ret;
+ }
+
Log_KernelPanic("MM", "TODO: Implement MM_MapHWPages");
return 0;
}
*/
void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
{
- Log_KernelPanic("MM", "TODO: Implement MM_UnmapHWPages");
+// Log_KernelPanic("MM", "TODO: Implement MM_UnmapHWPages");
+ while( Number -- )
+ {
+ MM_Unmap(VAddr);
+ VAddr += 0x1000;
+ }
+}
+
+
+/**
+ * \fn tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PhysAddr)
+ * \brief Allocates DMA physical memory
+ * \param Pages Number of pages required
+ * \param MaxBits Maximum number of bits the physical address can have
+ * \param PhysAddr Pointer to the location to place the physical address allocated
+ * \return Virtual address allocate
+ */
+tVAddr MM_AllocDMA(int Pages, int MaxBits, tPAddr *PhysAddr)
+{
+ tPAddr phys;
+ tVAddr ret;
+
+ // Sanity Check
+ if(MaxBits < 12 || !PhysAddr) return 0;
+
+ // Fast Allocate
+ if(Pages == 1 && MaxBits >= PHYS_BITS)
+ {
+ phys = MM_AllocPhys();
+ *PhysAddr = phys;
+ ret = MM_MapHWPages(phys, 1);
+ if(ret == 0) {
+ MM_DerefPhys(phys);
+ return 0;
+ }
+ return ret;
+ }
+
+ // Slow Allocate
+ phys = MM_AllocPhysRange(Pages, MaxBits);
+ // - Was it allocated?
+ if(phys == 0) return 0;
+
+ // Allocated successfully, now map
+ ret = MM_MapHWPages(phys, Pages);
+ if( ret == 0 ) {
+ // If it didn't map, free then return 0
+ for(;Pages--;phys+=0x1000)
+ MM_DerefPhys(phys);
+ return 0;
+ }
+
+ *PhysAddr = phys;
+ return ret;
}
// --- Tempory Mappings ---
tPAddr MM_Clone(void)
{
tPAddr ret;
+ int i;
+ tVAddr kstackbase = Proc_GetCurThread()->KernelStack - KERNEL_STACK_SIZE + 0x1000;
// #1 Create a copy of the PML4
ret = MM_AllocPhys();
if(!ret) return 0;
// #2 Alter the fractal pointer
+ Mutex_Acquire(&glMM_TempFractalLock);
+ TMPCR3() = ret | 3;
+ INVLPG_ALL();
+
+// Log_KernelPanic("MM", "TODO: Implement MM_Clone");
+
// #3 Set Copy-On-Write to all user pages
- // #4 Return
- return 0;
+ for( i = 0; i < 256; i ++)
+ {
+ TMPMAPLVL4(i) = PAGEMAPLVL4(i);
+// Log_Debug("MM", "TMPMAPLVL4(%i) = 0x%016llx", i, TMPMAPLVL4(i));
+ if( TMPMAPLVL4(i) & 1 )
+ {
+ MM_RefPhys( TMPMAPLVL4(i) & PADDR_MASK );
+ TMPMAPLVL4(i) |= PF_COW;
+ TMPMAPLVL4(i) &= ~PF_WRITE;
+ }
+ }
+
+ // #4 Map in kernel pages
+ for( i = 256; i < 512; i ++ )
+ {
+ // Skip addresses:
+ // 320 0xFFFFA.... - Kernel Stacks
+ if( i == 320 ) continue;
+ // 509 0xFFFFFE0.. - Fractal mapping
+ if( i == 509 ) continue;
+ // 510 0xFFFFFE8.. - Temp fractal mapping
+ if( i == 510 ) continue;
+ }
+
+ // #5 Set fractal mapping
+ TMPMAPLVL4(509) = ret | 3;
+ TMPMAPLVL4(510) = 0; // Temp
+
+ // #6 Create kernel stack
+ TMPMAPLVL4(320) = 0;
+ for( i = 0; i < KERNEL_STACK_SIZE/0x1000-1; i ++ )
+ {
+ tPAddr phys = MM_AllocPhys();
+ tVAddr tmpmapping;
+ MM_MapEx(kstackbase+i*0x1000, phys, 1, 0);
+
+ tmpmapping = MM_MapTemp(phys);
+ memcpy((void*)tmpmapping, (void*)(kstackbase+i*0x1000), 0x1000);
+ MM_FreeTemp(tmpmapping);
+ }
+
+ // #7 Return
+ TMPCR3() = 0;
+ INVLPG_ALL();
+ Mutex_Release(&glMM_TempFractalLock);
+ return ret;
}
void MM_ClearUser(void)
{
tVAddr addr = 0;
- // #1 Traverse the structure < 2^47, Deref'ing all pages
- // #2 Free tables/dirs/pdps once they have been cleared
+ int pml4, pdpt, pd, pt;
- for( addr = 0; addr < 0x800000000000; )
+ for( pml4 = 0; pml4 < 256; pml4 ++ )
{
- if( PAGEMAPLVL4(addr >> PML4_SHIFT) & 1 )
+ // Catch an un-allocated PML4 entry
+ if( !(PAGEMAPLVL4(pml4) & 1) ) {
+ addr += 1ULL << PML4_SHIFT;
+ continue ;
+ }
+
+ // Catch a large COW
+ if( (PAGEMAPLVL4(pml4) & PF_COW) ) {
+ addr += 1ULL << PML4_SHIFT;
+ }
+ else
{
- if( PAGEDIRPTR(addr >> PDP_SHIFT) & 1 )
+ // TODO: Large pages
+
+ // Child entries
+ for( pdpt = 0; pdpt < 512; pdpt ++ )
{
- if( PAGEDIR(addr >> PDIR_SHIFT) & 1 )
- {
- // Page
- if( PAGETABLE(addr >> PTAB_SHIFT) & 1 ) {
- MM_DerefPhys( PAGETABLE(addr >> PTAB_SHIFT) & PADDR_MASK );
- PAGETABLE(addr >> PTAB_SHIFT) = 0;
- }
- addr += 1 << PTAB_SHIFT;
- // Dereference the PDIR Entry
- if( (addr + (1 << PTAB_SHIFT)) >> PDIR_SHIFT != (addr >> PDIR_SHIFT) ) {
- MM_DerefPhys( PAGEMAPLVL4(addr >> PDIR_SHIFT) & PADDR_MASK );
- PAGEDIR(addr >> PDIR_SHIFT) = 0;
- }
- }
- else {
- addr += 1 << PDIR_SHIFT;
+ // Unallocated
+ if( !(PAGEDIRPTR(addr >> PDP_SHIFT) & 1) ) {
+ addr += 1ULL << PDP_SHIFT;
continue;
}
- // Dereference the PDP Entry
- if( (addr + (1 << PDIR_SHIFT)) >> PDP_SHIFT != (addr >> PDP_SHIFT) ) {
- MM_DerefPhys( PAGEMAPLVL4(addr >> PDP_SHIFT) & PADDR_MASK );
- PAGEDIRPTR(addr >> PDP_SHIFT) = 0;
+
+ // Catch a large COW
+ if( (PAGEDIRPTR(addr >> PDP_SHIFT) & PF_COW) ) {
+ addr += 1ULL << PDP_SHIFT;
}
- }
- else {
- addr += 1 << PDP_SHIFT;
- continue;
- }
- // Dereference the PML4 Entry
- if( (addr + (1 << PDP_SHIFT)) >> PML4_SHIFT != (addr >> PML4_SHIFT) ) {
- MM_DerefPhys( PAGEMAPLVL4(addr >> PML4_SHIFT) & PADDR_MASK );
- PAGEMAPLVL4(addr >> PML4_SHIFT) = 0;
+ else {
+ // Child entries
+ for( pd = 0; pd < 512; pd ++ )
+ {
+ // Unallocated PDir entry
+ if( !(PAGEDIR(addr >> PDIR_SHIFT) & 1) ) {
+ addr += 1ULL << PDIR_SHIFT;
+ continue;
+ }
+
+ // COW Page Table
+ if( PAGEDIR(addr >> PDIR_SHIFT) & PF_COW ) {
+ addr += 1ULL << PDIR_SHIFT;
+ }
+ else
+ {
+ // TODO: Catch large pages
+
+ // Child entries
+ for( pt = 0; pt < 512; pt ++ )
+ {
+ // Free page
+ if( PAGETABLE(addr >> PTAB_SHIFT) & 1 ) {
+ MM_DerefPhys( PAGETABLE(addr >> PTAB_SHIFT) & PADDR_MASK );
+ PAGETABLE(addr >> PTAB_SHIFT) = 0;
+ }
+ addr += 1ULL << 12;
+ }
+ }
+ // Free page table
+ MM_DerefPhys( PAGEDIR(addr >> PDIR_SHIFT) & PADDR_MASK );
+ PAGEDIR(addr >> PDIR_SHIFT) = 0;
+ }
+ }
+ // Free page directory
+ MM_DerefPhys( PAGEDIRPTR(addr >> PDP_SHIFT) & PADDR_MASK );
+ PAGEDIRPTR(addr >> PDP_SHIFT) = 0;
}
}
- else {
- addr += (tVAddr)1 << PML4_SHIFT;
- continue;
- }
+ // Free page directory pointer table (PML4 entry)
+ MM_DerefPhys( PAGEMAPLVL4(pml4) & PADDR_MASK );
+ PAGEMAPLVL4(pml4) = 0;
}
}
tVAddr MM_NewWorkerStack(void)
{
- return 0;
+ tVAddr ret;
+ int i;
+
+ // #1 Set temp fractal to PID0
+ Mutex_Acquire(&glMM_TempFractalLock);
+ TMPCR3() = ((tPAddr)gInitialPML4 - KERNEL_BASE) | 3;
+
+ // #2 Scan for a free stack addresss < 2^47
+ for(ret = 0x100000; ret < (1ULL << 47); ret += KERNEL_STACK_SIZE)
+ {
+ if( MM_GetPhysAddr(ret) == 0 ) break;
+ }
+ if( ret >= (1ULL << 47) ) {
+ Mutex_Release(&glMM_TempFractalLock);
+ return 0;
+ }
+
+ // #3 Map all save the last page in the range
+ // - This acts as as guard page, and doesn't cost us anything.
+ for( i = 0; i < KERNEL_STACK_SIZE/0x1000 - 1; i ++ )
+ {
+ tPAddr phys = MM_AllocPhys();
+ if(!phys) {
+ // TODO: Clean up
+ Log_Error("MM", "MM_NewWorkerStack - Unable to allocate page");
+ return 0;
+ }
+ MM_MapEx(ret + i*0x1000, phys, 1, 0);
+ }
+
+ Mutex_Release(&glMM_TempFractalLock);
+
+ return ret + i*0x1000;
}
+/**
+ * \brief Allocate a new kernel stack
+ */
tVAddr MM_NewKStack(void)
{
+ tVAddr base = MM_KSTACK_BASE;
+ Uint i;
+ for( ; base < MM_KSTACK_TOP; base += KERNEL_STACK_SIZE )
+ {
+ if(MM_GetPhysAddr(base) != 0)
+ continue;
+
+ //Log("MM_NewKStack: Found one at %p", base + KERNEL_STACK_SIZE);
+ for( i = 0; i < KERNEL_STACK_SIZE; i += 0x1000)
+ {
+ if( !MM_Allocate(base+i) )
+ {
+ Log_Warning("MM", "MM_NewKStack - Allocation failed");
+ for( i -= 0x1000; i; i -= 0x1000)
+ MM_Deallocate(base+i);
+ return 0;
+ }
+ }
+
+ return base + KERNEL_STACK_SIZE;
+ }
+ Log_Warning("MM", "MM_NewKStack - No address space left\n");
return 0;
}
git.ucc.asn.au / tpg / acess2.git / blobdiff
UCC git Repository :: git.ucc.asn.au