#define DEBUG 0
#define SANITY 1
#include <acess.h>
+#include <mm_virt.h>
#include <mm_phys.h>
#include <proc.h>
+#include <hal_proc.h>
+#include <arch_int.h>
-#if USE_PAE
-# define TAB 21
-# define DIR 30
-#else
-# define TAB 22
-#endif
+#define TAB 22
-#define KERNEL_STACKS 0xF0000000
-#define KERNEL_STACK_SIZE 0x00008000
-#define KERNEL_STACKS_END 0xFC000000
#define WORKER_STACKS 0x00100000 // Thread0 Only!
-#define WORKER_STACK_SIZE KERNEL_STACK_SIZE
+#define WORKER_STACK_SIZE MM_KERNEL_STACK_SIZE
#define WORKER_STACKS_END 0xB0000000
#define NUM_WORKER_STACKS ((WORKER_STACKS_END-WORKER_STACKS)/WORKER_STACK_SIZE)
#define PF_PRESENT 0x1
#define PF_WRITE 0x2
#define PF_USER 0x4
+#define PF_GLOBAL 0x80
#define PF_COW 0x200
-#define PF_PAGED 0x400
+#define PF_NOPAGE 0x400
#define INVLPG(addr) __asm__ __volatile__ ("invlpg (%0)"::"r"(addr))
-#if USE_PAE
-typedef Uint64 tTabEnt;
-#else
+#define GET_TEMP_MAPPING(cr3) do { \
+ __ASM__("cli"); \
+ __AtomicTestSetLoop( (Uint *)gpTmpCR3, cr3 | 3 ); \
+} while(0)
+#define REL_TEMP_MAPPING() do { \
+ *gpTmpCR3 = 0; \
+ __ASM__("sti"); \
+} while(0)
+
typedef Uint32 tTabEnt;
-#endif
// === IMPORTS ===
+extern char _UsertextEnd[], _UsertextBase[];
extern Uint32 gaInitPageDir[1024];
extern Uint32 gaInitPageTable[1024];
extern void Threads_SegFault(tVAddr Addr);
extern void Error_Backtrace(Uint eip, Uint ebp);
// === PROTOTYPES ===
-void MM_PreinitVirtual();
-void MM_InstallVirtual();
+void MM_PreinitVirtual(void);
+void MM_InstallVirtual(void);
void MM_PageFault(tVAddr Addr, Uint ErrorCode, tRegs *Regs);
-void MM_DumpTables(tVAddr Start, tVAddr End);
+//void MM_DumpTables(tVAddr Start, tVAddr End);
+//void MM_ClearUser(void);
tPAddr MM_DuplicatePage(tVAddr VAddr);
// === GLOBALS ===
#define gaPAE_TmpDir ((tTabEnt*)PAE_TMP_DIR_ADDR)
#define gaPAE_TmpPDPT ((tTabEnt*)PAE_TMP_PDPT_ADDR)
int gbUsePAE = 0;
- int gilTempMappings = 0;
- int gilTempFractal = 0;
+tMutex glTempMappings;
+tMutex glTempFractal;
Uint32 gWorkerStacks[(NUM_WORKER_STACKS+31)/32];
int giLastUsedWorker = 0;
+struct sPageInfo {
+ void *Node;
+ tVAddr Base;
+ Uint64 Offset;
+ int Length;
+ int Flags;
+} *gaMappedRegions; // sizeof = 24 bytes
// === CODE ===
/**
- * \fn void MM_PreinitVirtual()
+ * \fn void MM_PreinitVirtual(void)
* \brief Maps the fractal mappings
*/
-void MM_PreinitVirtual()
+void MM_PreinitVirtual(void)
{
- #if USE_PAE
- gaInitPageDir[ ((PAGE_TABLE_ADDR >> TAB)-3*512+3)*2 ] = ((tTabEnt)&gaInitPageDir - KERNEL_BASE) | 3;
- #else
gaInitPageDir[ PAGE_TABLE_ADDR >> 22 ] = ((tTabEnt)&gaInitPageDir - KERNEL_BASE) | 3;
- #endif
INVLPG( PAGE_TABLE_ADDR );
}
/**
- * \fn void MM_InstallVirtual()
+ * \fn void MM_InstallVirtual(void)
* \brief Sets up the constant page mappings
*/
-void MM_InstallVirtual()
+void MM_InstallVirtual(void)
{
int i;
- #if USE_PAE
- // --- Pre-Allocate kernel tables
- for( i = KERNEL_BASE >> TAB; i < 1024*4; i ++ )
- {
- if( gaPAE_PageDir[ i ] ) continue;
-
- // Skip stack tables, they are process unique
- if( i > KERNEL_STACKS >> TAB && i < KERNEL_STACKS_END >> TAB) {
- gaPAE_PageDir[ i ] = 0;
- continue;
- }
- // Preallocate table
- gaPAE_PageDir[ i ] = MM_AllocPhys() | 3;
- INVLPG( &gaPAE_PageTable[i*512] );
- memset( &gaPAE_PageTable[i*512], 0, 0x1000 );
- }
- #else
// --- Pre-Allocate kernel tables
for( i = KERNEL_BASE>>22; i < 1024; i ++ )
{
if( gaPageDir[ i ] ) continue;
// Skip stack tables, they are process unique
- if( i > KERNEL_STACKS >> 22 && i < KERNEL_STACKS_END >> 22) {
+ if( i > MM_KERNEL_STACKS >> 22 && i < MM_KERNEL_STACKS_END >> 22) {
gaPageDir[ i ] = 0;
continue;
}
INVLPG( &gaPageTable[i*1024] );
memset( &gaPageTable[i*1024], 0, 0x1000 );
}
- #endif
+
+ // Unset kernel on the User Text pages
+ for( i = ((tVAddr)&_UsertextEnd-(tVAddr)&_UsertextBase+0xFFF)/4096; i--; ) {
+ MM_SetFlags( (tVAddr)&_UsertextBase + i*4096, 0, MM_PFLAG_KERNEL );
+ }
+
+ *gpTmpCR3 = 0;
}
/**
* \brief Cleans up the SMP required mappings
*/
-void MM_FinishVirtualInit()
+void MM_FinishVirtualInit(void)
{
- #if USE_PAE
- gaInitPDPT[ 0 ] = 0;
- #else
gaInitPageDir[ 0 ] = 0;
- #endif
}
/**
//ENTER("xAddr bErrorCode", Addr, ErrorCode);
// -- Check for COW --
- if( gaPageDir [Addr>>22] & PF_PRESENT
- && gaPageTable[Addr>>12] & PF_PRESENT
+ if( gaPageDir [Addr>>22] & PF_PRESENT && gaPageTable[Addr>>12] & PF_PRESENT
&& gaPageTable[Addr>>12] & PF_COW )
{
tPAddr paddr;
gaPageTable[Addr>>12] |= paddr|PF_PRESENT|PF_WRITE;
}
+// Log_Debug("MMVirt", "COW for %p (%P)", Addr, gaPageTable[Addr>>12]);
+
INVLPG( Addr & ~0xFFF );
- //LEAVE('-')
return;
}
-
+
+ // Disable instruction tracing
+ __ASM__("pushf; andw $0xFEFF, 0(%esp); popf");
+ Proc_GetCurThread()->bInstrTrace = 0;
+
// If it was a user, tell the thread handler
if(ErrorCode & 4) {
- Warning("%s %s %s memory%s",
- (ErrorCode&4?"User":"Kernel"),
+ Log_Warning("MMVirt", "User %s %s memory%s",
(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->eip, Addr);
- __asm__ __volatile__ ("sti"); // Restart IRQs
+ Log_Warning("MMVirt", "Instruction %04x:%08x accessed %p", Regs->cs, Regs->eip, Addr);
+ __ASM__("sti"); // Restart IRQs
+ #if 1
+ Error_Backtrace(Regs->eip, Regs->ebp);
+ #endif
Threads_SegFault(Addr);
return ;
}
Warning("Reserved Bits Trashed!");
else
{
- Warning("%s %s %s memory%s",
- (ErrorCode&4?"User":"Kernel"),
+ Warning("Kernel %s %s memory%s",
(ErrorCode&2?"write to":"read from"),
(ErrorCode&1?"bad/locked":"non-present"),
(ErrorCode&16?" (Instruction Fetch)":"")
);
}
- Log("Code at %p accessed %p", Regs->eip, Addr);
+ Log("CPU %i - Code at %p accessed %p", GetCPUNum(), Regs->eip, Addr);
// Print Stack Backtrace
Error_Backtrace(Regs->eip, Regs->ebp);
-
+
+ #if 0
Log("gaPageDir[0x%x] = 0x%x", Addr>>22, gaPageDir[Addr>>22]);
if( gaPageDir[Addr>>22] & PF_PRESENT )
Log("gaPageTable[0x%x] = 0x%x", Addr>>12, gaPageTable[Addr>>12]);
-
+ #endif
//MM_DumpTables(0, -1);
+ // Register Dump
+ Log("EAX %08x ECX %08x EDX %08x EBX %08x", Regs->eax, Regs->ecx, Regs->edx, Regs->ebx);
+ Log("ESP %08x EBP %08x ESI %08x EDI %08x", Regs->esp, Regs->ebp, Regs->esi, Regs->edi);
+ //Log("SS:ESP %04x:%08x", Regs->ss, Regs->esp);
+ Log("CS:EIP %04x:%08x", Regs->cs, Regs->eip);
+ Log("DS %04x ES %04x FS %04x GS %04x", Regs->ds, Regs->es, Regs->fs, Regs->gs);
+ {
+ Uint dr0, dr1;
+ __ASM__ ("mov %%dr0, %0":"=r"(dr0):);
+ __ASM__ ("mov %%dr1, %0":"=r"(dr1):);
+ Log("DR0 %08x DR1 %08x", dr0, dr1);
+ }
+
Panic("Page Fault at 0x%x (Accessed 0x%x)", Regs->eip, Addr);
}
{
tVAddr rangeStart = 0;
tPAddr expected = 0;
+ void *expected_node = NULL, *tmpnode = NULL;
tVAddr curPos;
Uint page;
- const tPAddr MASK = ~0xF98;
+ const tPAddr MASK = ~0xF78;
Start >>= 12; End >>= 12;
{
if( !(gaPageDir[curPos>>22] & PF_PRESENT)
|| !(gaPageTable[page] & PF_PRESENT)
- || (gaPageTable[page] & MASK) != expected)
+ || (gaPageTable[page] & MASK) != expected
+ || (tmpnode=NULL,MM_GetPageNode(expected, &tmpnode), tmpnode != expected_node))
{
if(expected) {
- Log(" 0x%08x-0x%08x => 0x%08x-0x%08x (%s%s%s%s)",
- rangeStart, curPos - 1,
- gaPageTable[rangeStart>>12] & ~0xFFF,
- (expected & ~0xFFF) - 1,
- (expected & PF_PAGED ? "p" : "-"),
- (expected & PF_COW ? "C" : "-"),
- (expected & PF_USER ? "U" : "-"),
- (expected & PF_WRITE ? "W" : "-")
+ tPAddr orig = gaPageTable[rangeStart>>12];
+ Log(" 0x%08x => 0x%08x - 0x%08x (%s%s%s%s%s) %p",
+ rangeStart,
+ orig & ~0xFFF,
+ curPos - rangeStart,
+ (orig & PF_NOPAGE ? "P" : "-"),
+ (orig & PF_COW ? "C" : "-"),
+ (orig & PF_GLOBAL ? "G" : "-"),
+ (orig & PF_USER ? "U" : "-"),
+ (orig & PF_WRITE ? "W" : "-"),
+ expected_node
);
expected = 0;
}
if( !(gaPageTable[curPos>>12] & PF_PRESENT) ) continue;
expected = (gaPageTable[page] & MASK);
+ MM_GetPageNode(expected, &expected_node);
rangeStart = curPos;
}
if(expected) expected += 0x1000;
}
if(expected) {
- Log("0x%08x-0x%08x => 0x%08x-0x%08x (%s%s%s%s)",
- rangeStart, curPos - 1,
- gaPageTable[rangeStart>>12] & ~0xFFF,
- (expected & ~0xFFF) - 1,
- (expected & PF_PAGED ? "p" : "-"),
- (expected & PF_COW ? "C" : "-"),
- (expected & PF_USER ? "U" : "-"),
- (expected & PF_WRITE ? "W" : "-")
+ tPAddr orig = gaPageTable[rangeStart>>12];
+ Log("0x%08x => 0x%08x - 0x%08x (%s%s%s%s%s) %p",
+ rangeStart,
+ orig & ~0xFFF,
+ curPos - rangeStart,
+ (orig & PF_NOPAGE ? "p" : "-"),
+ (orig & PF_COW ? "C" : "-"),
+ (orig & PF_GLOBAL ? "G" : "-"),
+ (orig & PF_USER ? "U" : "-"),
+ (orig & PF_WRITE ? "W" : "-"),
+ expected_node
);
expected = 0;
}
{
tPAddr paddr;
//ENTER("xVAddr", VAddr);
- //__asm__ __volatile__ ("xchg %bx,%bx");
+ //__ASM__("xchg %bx,%bx");
// Check if the directory is mapped
if( gaPageDir[ VAddr >> 22 ] == 0 )
{
// Allocate directory
paddr = MM_AllocPhys();
- //LOG("paddr = 0x%llx (new table)", paddr);
if( paddr == 0 ) {
Warning("MM_Allocate - Out of Memory (Called by %p)", __builtin_return_address(0));
//LEAVE('i',0);
return 0;
}
- // Map
+ // Map and mark as user (if needed)
gaPageDir[ VAddr >> 22 ] = paddr | 3;
- // Mark as user
if(VAddr < MM_USER_MAX) gaPageDir[ VAddr >> 22 ] |= PF_USER;
INVLPG( &gaPageDir[ VAddr >> 22 ] );
- //LOG("Clearing new table");
memsetd( &gaPageTable[ (VAddr >> 12) & ~0x3FF ], 0, 1024 );
}
// Check if the page is already allocated
return (gaPageTable[Addr >> 12] & ~0xFFF) | (Addr & 0xFFF);
}
-
/**
- * \fn int MM_IsUser(tVAddr VAddr)
- * \brief Checks if a page is user accessable
- */
-int MM_IsUser(tVAddr VAddr)
-{
- if( !(gaPageDir[VAddr >> 22] & 1) )
- return 0;
- if( !(gaPageTable[VAddr >> 12] & 1) )
- return 0;
- if( !(gaPageTable[VAddr >> 12] & PF_USER) )
- return 0;
- return 1;
-}
-
-/**
- * \fn void MM_SetCR3(tPAddr CR3)
+ * \fn void MM_SetCR3(Uint CR3)
* \brief Sets the current process space
*/
-void MM_SetCR3(tPAddr CR3)
+void MM_SetCR3(Uint CR3)
{
- __asm__ __volatile__ ("mov %0, %%cr3"::"r"(CR3));
+ __ASM__("mov %0, %%cr3"::"r"(CR3));
}
/**
//ENTER("xVAddr xPAddr", VAddr, PAddr);
// Sanity check
if( PAddr & 0xFFF || VAddr & 0xFFF ) {
- Warning("MM_Map - Physical or Virtual Addresses are not aligned");
+ Log_Warning("MM_Virt", "MM_Map - Physical or Virtual Addresses are not aligned");
//LEAVE('i', 0);
return 0;
}
// Check if the directory is mapped
if( gaPageDir[ VAddr >> 22 ] == 0 )
{
- gaPageDir[ VAddr >> 22 ] = MM_AllocPhys() | 3;
+ tPAddr tmp = MM_AllocPhys();
+ if( tmp == 0 )
+ return 0;
+ gaPageDir[ VAddr >> 22 ] = tmp | 3;
// Mark as user
if(VAddr < MM_USER_MAX) gaPageDir[ VAddr >> 22 ] |= PF_USER;
}
/**
- * \fn tVAddr MM_ClearUser()
* \brief Clear user's address space
*/
-tVAddr MM_ClearUser()
+void MM_ClearUser(void)
{
Uint i, j;
- // Copy Directories
for( i = 0; i < (MM_USER_MAX>>22); i ++ )
{
// Check if directory is not allocated
continue;
}
-
+ // Deallocate tables
for( j = 0; j < 1024; j ++ )
{
if( gaPageTable[i*1024+j] & 1 )
gaPageTable[i*1024+j] = 0;
}
+ // Deallocate directory
MM_DerefPhys( gaPageDir[i] & ~0xFFF );
gaPageDir[i] = 0;
INVLPG( &gaPageTable[i*1024] );
}
INVLPG( gaPageDir );
+}
+
+/**
+ * \brief Deallocate an address space
+ */
+void MM_ClearSpace(Uint32 CR3)
+{
+ int i, j;
- return *gpPageCR3;
+ if(CR3 == (*gpPageCR3 & ~0xFFF)) {
+ Log_Error("MMVirt", "Can't clear current address space");
+ return ;
+ }
+
+ if( MM_GetRefCount(CR3) > 1 ) {
+ MM_DerefPhys(CR3);
+ Log_Log("MMVirt", "CR3 %P is still referenced, not cleaning (but dereferenced)", CR3);
+ return ;
+ }
+
+ Log_Debug("MMVirt", "Clearing out address space 0x%x from 0x%x", CR3, *gpPageCR3);
+
+ GET_TEMP_MAPPING(CR3);
+ INVLPG( gaTmpDir );
+
+ for( i = 0; i < 1024; i ++ )
+ {
+ Uint32 *table = &gaTmpTable[i*1024];
+ if( !(gaTmpDir[i] & PF_PRESENT) )
+ continue ;
+
+ INVLPG( table );
+
+ if( i < 768 || (i > MM_KERNEL_STACKS >> 22 && i < MM_KERNEL_STACKS_END >> 22) )
+ {
+ for( j = 0; j < 1024; j ++ )
+ {
+ if( !(table[j] & 1) )
+ continue;
+ MM_DerefPhys( table[j] & ~0xFFF );
+ }
+ }
+
+ if( i != (PAGE_TABLE_ADDR >> 22) )
+ {
+ MM_DerefPhys( gaTmpDir[i] & ~0xFFF );
+ }
+ }
+
+
+ MM_DerefPhys( CR3 );
+
+ REL_TEMP_MAPPING();
}
/**
- * \fn tPAddr MM_Clone()
+ * \fn tPAddr MM_Clone(void)
* \brief Clone the current address space
*/
-tPAddr MM_Clone()
+tPAddr MM_Clone(int bNoUserCopy)
{
Uint i, j;
- tVAddr ret;
+ tPAddr ret;
Uint page = 0;
- tVAddr kStackBase = Proc_GetCurThread()->KernelStack - KERNEL_STACK_SIZE;
+ tVAddr kStackBase = Proc_GetCurThread()->KernelStack - MM_KERNEL_STACK_SIZE;
void *tmp;
- LOCK( &gilTempFractal );
-
// Create Directory Table
- *gpTmpCR3 = MM_AllocPhys() | 3;
+ ret = MM_AllocPhys();
+ if( ret == 0 ) {
+ return 0;
+ }
+
+ // Map
+ GET_TEMP_MAPPING( ret );
INVLPG( gaTmpDir );
- //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 && !bNoUserCopy )
+ {
+ // 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];
}
}
gaTmpDir[ PAGE_TABLE_ADDR >> 22 ] = *gpTmpCR3;
continue;
}
+ if( i == (TMP_TABLE_ADDR >> 22) ) {
+ gaTmpDir[ TMP_TABLE_ADDR >> 22 ] = 0;
+ continue ;
+ }
if( gaPageDir[i] == 0 ) {
gaTmpDir[i] = 0;
}
// Allocate kernel stack
- for(i = KERNEL_STACKS >> 22;
- i < KERNEL_STACKS_END >> 22;
- i ++ )
+ for(i = MM_KERNEL_STACKS >> 22; i < MM_KERNEL_STACKS_END >> 22; i ++ )
{
// Check if directory is allocated
if( (gaPageDir[i] & 1) == 0 ) {
}
// We don't care about other kernel stacks
- if( ((i*1024+j)*4096 & ~(KERNEL_STACK_SIZE-1)) != kStackBase ) {
+ if( ((i*1024+j)*4096 & ~(MM_KERNEL_STACK_SIZE-1)) != kStackBase ) {
gaTmpTable[i*1024+j] = 0;
continue;
}
}
}
- ret = *gpTmpCR3 & ~0xFFF;
- RELEASE( &gilTempFractal );
+ REL_TEMP_MAPPING();
//LEAVE('x', ret);
return ret;
}
/**
- * \fn tVAddr MM_NewKStack()
+ * \fn tVAddr MM_NewKStack(void)
* \brief Create a new kernel stack
*/
-tVAddr MM_NewKStack()
+tVAddr MM_NewKStack(void)
{
- tVAddr base = KERNEL_STACKS;
+ tVAddr base;
Uint i;
- for(;base<KERNEL_STACKS_END;base+=KERNEL_STACK_SIZE)
+ for(base = MM_KERNEL_STACKS; base < MM_KERNEL_STACKS_END; base += MM_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 = MM_KERNEL_STACK_SIZE; i -= 0x1000 ; )
+ for(i = 0; i < MM_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 < MM_KERNEL_STACK_SIZE; i += 0x1000 )
+ // MM_Deallocate(base+i);
+ return 0;
+ }
}
- return base+KERNEL_STACK_SIZE;
+ // Success
+// Log("MM_NewKStack - Allocated %p", base + MM_KERNEL_STACK_SIZE);
+ return base+MM_KERNEL_STACK_SIZE;
}
- Warning("MM_NewKStack - No address space left\n");
+ // No stacks left
+ Log_Warning("MMVirt", "MM_NewKStack - No address space left");
return 0;
}
* \fn tVAddr MM_NewWorkerStack()
* \brief Creates a new worker stack
*/
-tVAddr MM_NewWorkerStack()
+tVAddr MM_NewWorkerStack(Uint *StackContents, size_t ContentsSize)
{
- Uint esp, ebp;
- Uint oldstack;
Uint base, addr;
- int i, j;
- Uint *tmpPage;
- tPAddr pages[WORKER_STACK_SIZE>>12];
-
- // Get the old ESP and EBP
- __asm__ __volatile__ ("mov %%esp, %0": "=r"(esp));
- __asm__ __volatile__ ("mov %%ebp, %0": "=r"(ebp));
+ tVAddr tmpPage;
+ tPAddr page;
+ // TODO: Thread safety
// Find a free worker stack address
for(base = giLastUsedWorker; base < NUM_WORKER_STACKS; base++)
{
base = WORKER_STACKS + base * WORKER_STACK_SIZE;
//Log(" MM_NewWorkerStack: base = 0x%x", base);
- // Acquire the lock for the temp fractal mappings
- LOCK(&gilTempFractal);
-
// Set the temp fractals to TID0's address space
- *gpTmpCR3 = ((Uint)gaInitPageDir - KERNEL_BASE) | 3;
- //Log(" MM_NewWorkerStack: *gpTmpCR3 = 0x%x", *gpTmpCR3);
+ GET_TEMP_MAPPING( ((Uint)gaInitPageDir - KERNEL_BASE) );
INVLPG( gaTmpDir );
-
// Check if the directory is mapped (we are assuming that the stacks
// will fit neatly in a directory)
//Log(" MM_NewWorkerStack: gaTmpDir[ 0x%x ] = 0x%x", base>>22, gaTmpDir[ base >> 22 ]);
// Mapping Time!
for( addr = 0; addr < WORKER_STACK_SIZE; addr += 0x1000 )
{
- pages[ addr >> 12 ] = MM_AllocPhys();
- gaTmpTable[ (base + addr) >> 12 ] = pages[addr>>12] | 3;
- }
- *gpTmpCR3 = 0;
- // Release the temp mapping lock
- RELEASE(&gilTempFractal);
-
- // Copy the old stack
- oldstack = (esp + KERNEL_STACK_SIZE-1) & ~(KERNEL_STACK_SIZE-1);
- esp = oldstack - esp; // ESP as an offset in the stack
-
- // Make `base` be the top of the stack
- base += WORKER_STACK_SIZE;
-
- i = (WORKER_STACK_SIZE>>12) - 1;
- // Copy the contents of the old stack to the new one, altering the addresses
- // `addr` is refering to bytes from the stack base (mem downwards)
- for(addr = 0; addr < esp; addr += 0x1000)
- {
- Uint *stack = (Uint*)( oldstack-(addr+0x1000) );
- tmpPage = (void*)MM_MapTemp( pages[i] );
- // Copy old stack
- for(j = 0; j < 1024; j++)
- {
- // Possible Stack address?
- if(oldstack-esp < stack[j] && stack[j] < oldstack)
- tmpPage[j] = base - (oldstack - stack[j]);
- else // Seems not, best leave it alone
- tmpPage[j] = stack[j];
- }
- MM_FreeTemp((tVAddr)tmpPage);
- i --;
+ page = MM_AllocPhys();
+ gaTmpTable[ (base + addr) >> 12 ] = page | 3;
}
+
+ // Release temporary fractal
+ REL_TEMP_MAPPING();
+
+ // NOTE: Max of 1 page
+ // `page` is the last allocated page from the previious for loop
+ tmpPage = MM_MapTemp( page );
+ memcpy( (void*)( tmpPage + (0x1000 - ContentsSize) ), StackContents, ContentsSize);
+ MM_FreeTemp(tmpPage);
//Log("MM_NewWorkerStack: RETURN 0x%x", base);
- return base;
+ return base + WORKER_STACK_SIZE;
}
/**
// Read-Only
if( Mask & MM_PFLAG_RO )
{
- if( Flags & MM_PFLAG_RO ) *ent &= ~PF_WRITE;
- else *ent |= PF_WRITE;
+ if( Flags & MM_PFLAG_RO ) {
+ *ent &= ~PF_WRITE;
+ }
+ else {
+ gaPageDir[VAddr >> 22] |= PF_WRITE;
+ *ent |= PF_WRITE;
+ }
}
// Kernel
if( Mask & MM_PFLAG_KERNEL )
{
- if( Flags & MM_PFLAG_KERNEL ) *ent &= ~PF_USER;
- else *ent |= PF_USER;
+ if( Flags & MM_PFLAG_KERNEL ) {
+ *ent &= ~PF_USER;
+ }
+ else {
+ gaPageDir[VAddr >> 22] |= PF_USER;
+ *ent |= PF_USER;
+ }
}
// Copy-On-Write
*ent |= PF_WRITE;
}
}
+
+ //Log("MM_SetFlags: *ent = 0x%08x, gaPageDir[%i] = 0x%08x",
+ // *ent, VAddr >> 22, gaPageDir[VAddr >> 22]);
+}
+
+/**
+ * \brief Get the flags on a page
+ */
+Uint MM_GetFlags(tVAddr VAddr)
+{
+ tTabEnt *ent;
+ Uint ret = 0;
+
+ // Validity Check
+ if( !(gaPageDir[VAddr >> 22] & 1) ) return 0;
+ if( !(gaPageTable[VAddr >> 12] & 1) ) return 0;
+
+ ent = &gaPageTable[VAddr >> 12];
+
+ // Read-Only
+ if( !(*ent & PF_WRITE) ) ret |= MM_PFLAG_RO;
+ // Kernel
+ if( !(*ent & PF_USER) ) ret |= MM_PFLAG_KERNEL;
+ // Copy-On-Write
+ if( *ent & PF_COW ) ret |= MM_PFLAG_COW;
+
+ return ret;
+}
+
+/**
+ * \brief Check if the provided buffer is valid
+ * \return Boolean valid
+ */
+int MM_IsValidBuffer(tVAddr Addr, size_t Size)
+{
+ int bIsUser;
+ int dir, tab;
+
+ Size += Addr & (PAGE_SIZE-1);
+ Addr &= ~(PAGE_SIZE-1);
+
+ dir = Addr >> 22;
+ tab = Addr >> 12;
+
+// Debug("Addr = %p, Size = 0x%x, dir = %i, tab = %i", Addr, Size, dir, tab);
+
+ if( !(gaPageDir[dir] & 1) ) return 0;
+ if( !(gaPageTable[tab] & 1) ) return 0;
+
+ bIsUser = !!(gaPageTable[tab] & PF_USER);
+
+ while( Size >= PAGE_SIZE )
+ {
+ if( (tab & 1023) == 0 )
+ {
+ dir ++;
+ if( !(gaPageDir[dir] & 1) ) return 0;
+ }
+
+ if( !(gaPageTable[tab] & 1) ) return 0;
+ if( bIsUser && !(gaPageTable[tab] & PF_USER) ) return 0;
+
+ tab ++;
+ Size -= PAGE_SIZE;
+ }
+ return 1;
}
/**
// Allocate new page
ret = MM_AllocPhys();
+ if( !ret ) {
+ return 0;
+ }
// Write-lock the page (to keep data constistent), saving its R/W state
wasRO = (gaPageTable[VAddr >> 12] & PF_WRITE ? 0 : 1);
PAddr &= ~0xFFF;
- //LOG("gilTempMappings = %i", gilTempMappings);
+ //LOG("glTempMappings = %i", glTempMappings);
for(;;)
{
- LOCK( &gilTempMappings );
+ Mutex_Acquire( &glTempMappings );
for( i = 0; i < NUM_TEMP_PAGES; i ++ )
{
gaPageTable[ (TEMP_MAP_ADDR >> 12) + i ] = PAddr | 3;
INVLPG( TEMP_MAP_ADDR + (i << 12) );
//LEAVE('p', TEMP_MAP_ADDR + (i << 12));
- RELEASE( &gilTempMappings );
+ Mutex_Release( &glTempMappings );
return TEMP_MAP_ADDR + (i << 12);
}
- RELEASE( &gilTempMappings );
- Threads_Yield();
+ Mutex_Release( &glTempMappings );
+ Threads_Yield(); // TODO: Use a sleep queue here instead
}
}
if(Pages == 1 && MaxBits >= PHYS_BITS)
{
phys = MM_AllocPhys();
+ if( !phys ) {
+ *PhysAddr = 0;
+ LEAVE_RET('i', 0);
+ }
*PhysAddr = phys;
ret = MM_MapHWPages(phys, 1);
if(ret == 0) {
void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
{
int i, j;
+
+ //Log_Debug("VirtMem", "MM_UnmapHWPages: (VAddr=0x%08x, Number=%i)", VAddr, Number);
+
// Sanity Check
- if(VAddr < HW_MAP_ADDR || VAddr-Number*0x1000 > HW_MAP_MAX) return;
+ if(VAddr < HW_MAP_ADDR || VAddr+Number*0x1000 > HW_MAP_MAX) return;
i = VAddr >> 12;
- LOCK( &gilTempMappings ); // Temp and HW share a directory, so they share a lock
+ Mutex_Acquire( &glTempMappings ); // Temp and HW share a directory, so they share a lock
for( j = 0; j < Number; j++ )
{
- MM_DerefPhys( gaPageTable[ (HW_MAP_ADDR >> 12) + i + j ] );
- gaPageTable[ (HW_MAP_ADDR >> 12) + i + j ] = 0;
+ MM_DerefPhys( gaPageTable[ i + j ] & ~0xFFF );
+ gaPageTable[ i + j ] = 0;
}
- RELEASE( &gilTempMappings );
+ Mutex_Release( &glTempMappings );
}
-// --- EXPORTS ---
-EXPORT(MM_GetPhysAddr);
-EXPORT(MM_Map);
-//EXPORT(MM_Unmap);
-EXPORT(MM_MapHWPages);
-EXPORT(MM_AllocDMA);
-EXPORT(MM_UnmapHWPages);