* ARM7 Virtual Memory Manager
* - arch/arm7/mm_virt.c
*/
+#define DEBUG 0
+#include <acess.h>
#include <mm_virt.h>
+#include <hal_proc.h>
+
+#define AP_KRW_ONLY 0x1
+#define AP_KRO_ONLY 0x5
+#define AP_RW_BOTH 0x3
+#define AP_RO_BOTH 0x6
+
+// === IMPORTS ===
+extern Uint32 kernel_table0[];
// === TYPES ===
typedef struct
tPAddr PhysAddr;
Uint8 Size;
Uint8 Domain;
+ BOOL bExecutable;
+ BOOL bGlobal;
+ BOOL bShared;
+ int AP;
} tMM_PageInfo;
+//#define FRACTAL(table1, addr) ((table1)[ (0xFF8/4*1024) + ((addr)>>20)])
+#define FRACTAL(table1, addr) ((table1)[ (0xFF8/4*1024) + ((addr)>>22)])
+#define TLBIALL() __asm__ __volatile__ ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0))
+
+// === PROTOTYPES ===
+void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1);
+ int MM_int_AllocateCoarse(tVAddr VAddr, int Domain);
+ int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
+ int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi);
+
// === GLOBALS ===
-Uint32 *gMM_KernelTable0 = (void*)MM_TABLE0KERN;
-Uint32 *gMM_KernelTable1 = (void*)MM_TABLE1KERN;
// === CODE ===
int MM_InitialiseVirtual(void)
{
+ return 0;
}
-int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
+void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1)
{
- Uint32 *table0, table1;
- Uint32 desc;
-
- if(VAddr & 0x80000000 ) {
- table0 = MM_TABLE0KERN;
- table1 = MM_TABLE1KERN;
+ if(VAddr & 0x80000000) {
+ *Table0 = (void*)&kernel_table0; // Level 0
+ *Table1 = (void*)MM_TABLE1KERN; // Level 1
}
else {
- table0 = MM_TABLE0USER;
- table1 = MM_TABLE1USER;
+ *Table0 = (void*)MM_TABLE0USER;
+ *Table1 = (void*)MM_TABLE1USER;
+ }
+}
+
+int MM_int_AllocateCoarse(tVAddr VAddr, int Domain)
+{
+ Uint32 *table0, *table1;
+ Uint32 *desc;
+ tPAddr paddr;
+
+ ENTER("xVAddr iDomain", VAddr, Domain);
+
+ MM_int_GetTables(VAddr, &table0, &table1);
+
+ VAddr &= ~(0x400000-1); // 4MiB per "block", 1 Page
+
+ desc = &table0[ VAddr>>20];
+ LOG("desc = %p", desc);
+
+ // table0: 4 bytes = 1 MiB
+
+ LOG("desc[0] = %x", desc[0]);
+ LOG("desc[1] = %x", desc[1]);
+ LOG("desc[2] = %x", desc[2]);
+ LOG("desc[3] = %x", desc[3]);
+
+ if( (desc[0] & 3) != 0 || (desc[1] & 3) != 0
+ || (desc[2] & 3) != 0 || (desc[3] & 3) != 0 )
+ {
+ // Error?
+ LEAVE('i', 1);
+ return 1;
+ }
+
+ paddr = MM_AllocPhys();
+ if( !paddr )
+ {
+ // Error
+ LEAVE('i', 2);
+ return 2;
+ }
+
+ *desc = paddr | (Domain << 5) | 1;
+ desc[1] = desc[0] + 0x400;
+ desc[2] = desc[0] + 0x800;
+ desc[3] = desc[0] + 0xC00;
+
+ FRACTAL(table1, VAddr) = paddr | 3;
+
+ // TLBIALL
+ TLBIALL();
+
+ LEAVE('i', 0);
+ return 0;
+}
+
+int MM_int_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
+{
+ Uint32 *table0, *table1;
+ Uint32 *desc;
+
+ ENTER("pVADdr ppi", VAddr, pi);
+
+ MM_int_GetTables(VAddr, &table0, &table1);
+
+ desc = &table0[ VAddr >> 20 ];
+ LOG("desc = %p", desc);
+
+ switch(pi->Size)
+ {
+ case 12: // Small Page
+ case 16: // Large Page
+ LOG("Page");
+ if( (*desc & 3) == 0 ) {
+ MM_int_AllocateCoarse( VAddr, pi->Domain );
+ }
+ desc = &table1[ VAddr >> 12 ];
+ LOG("desc (2) = %p", desc);
+ if( pi->Size == 12 )
+ {
+ // Small page
+ // - Error if overwriting a large page
+ if( (*desc & 3) == 1 ) LEAVE_RET('i', 1);
+ if( pi->PhysAddr == 0 ) {
+ *desc = 0;
+ LEAVE('i', 0);
+ return 0;
+ }
+
+ *desc = (pi->PhysAddr & 0xFFFFF000) | 2;
+ if(!pi->bExecutable) *desc |= 1; // XN
+ if(!pi->bGlobal) *desc |= 1 << 11; // NG
+ if( pi->bShared) *desc |= 1 << 10; // S
+ *desc |= (pi->AP & 3) << 4; // AP
+ *desc |= ((pi->AP >> 2) & 1) << 9; // APX
+ LEAVE('i', 0);
+ return 0;
+ }
+ else
+ {
+ // Large page
+ // TODO:
+ }
+ break;
+ case 20: // Section or unmapped
+ Warning("TODO: Implement sections");
+ break;
+ case 24: // Supersection
+ // Error if not aligned
+ if( VAddr & 0xFFFFFF ) {
+ LEAVE('i', 1);
+ return 1;
+ }
+ if( (*desc & 3) == 0 || ((*desc & 3) == 2 && (*desc & (1 << 18))) )
+ {
+ if( pi->PhysAddr == 0 ) {
+ *desc = 0;
+ // TODO: Apply to all entries
+ LEAVE('i', 0);
+ return 0;
+ }
+ // Apply
+ *desc = pi->PhysAddr & 0xFF000000;
+// *desc |= ((pi->PhysAddr >> 32) & 0xF) << 20;
+// *desc |= ((pi->PhysAddr >> 36) & 0x7) << 5;
+ *desc |= 2 | (1 << 18);
+ // TODO: Apply to all entries
+ LEAVE('i', 0);
+ return 0;
+ }
+ // TODO: What here?
+ LEAVE('i', 1);
+ return 1;
}
- VAddr & 0x7FFFFFFF;
+
+ LEAVE('i', 1);
+ return 1;
+}
+
+extern tShortSpinlock glDebug_Lock;
+
+int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
+{
+ Uint32 *table0, *table1;
+ Uint32 desc;
+
+ MM_int_GetTables(VAddr, &table0, &table1);
desc = table0[ VAddr >> 20 ];
+// if( VAddr > 0x90000000)
+// LOG("table0 desc(%p) = %x", &table0[ VAddr >> 20 ], desc);
+
+ pi->bExecutable = 1;
+ pi->bGlobal = 0;
+ pi->bShared = 0;
+
+
switch( (desc & 3) )
{
// 0: Unmapped
pi->Domain = (desc >> 5) & 7;
// Get next level
desc = table1[ VAddr >> 12 ];
+// LOG("table1 desc(%p) = %x", &table1[ VAddr >> 12 ], desc);
switch( desc & 3 )
{
// 0: Unmapped
pi->PhysAddr = desc & 0xFFFFF000;
pi->bExecutable = desc & 1;
pi->bGlobal = !(desc >> 11);
- pi->bSharec = (desc >> 10) & 1;
- return 1;
+ pi->bShared = (desc >> 10) & 1;
+ return 0;
}
return 1;
if( desc & (1 << 18) ) {
// Supersection
pi->PhysAddr = desc & 0xFF000000;
- pi->PhysAddr |= ((desc >> 20) & 0xF) << 32;
- pi->PhysAddr |= ((desc >> 5) & 0x7) << 36;
+ pi->PhysAddr |= (Uint64)((desc >> 20) & 0xF) << 32;
+ pi->PhysAddr |= (Uint64)((desc >> 5) & 0x7) << 36;
pi->Size = 24;
pi->Domain = 0; // Superpages default to zero
return 0;
pi->Domain = 0;
return 2;
}
+ return 2;
}
// --- Exports ---
tMM_PageInfo pi;
if( MM_int_GetPageInfo(VAddr, &pi) )
return 0;
+ return pi.PhysAddr | (VAddr & ((1 << pi.Size)-1));
+}
+
+Uint MM_GetFlags(tVAddr VAddr)
+{
+ tMM_PageInfo pi;
+ int ret;
+
+ if( MM_int_GetPageInfo(VAddr, &pi) )
+ return 0;
+
+ ret = 0;
+
+ switch(pi.AP)
+ {
+ case AP_KRW_ONLY:
+ ret |= MM_PFLAG_KERNEL;
+ break;
+ case AP_KRO_ONLY:
+ ret |= MM_PFLAG_KERNEL|MM_PFLAG_RO;
+ break;
+ case AP_RW_BOTH:
+ break;
+ case AP_RO_BOTH:
+ ret |= MM_PFLAG_RO;
+ break;
+ }
+
+ if( pi.bExecutable ) ret |= MM_PFLAG_EXEC;
+ return ret;
+}
+
+void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
+{
+ tMM_PageInfo pi;
+ if( MM_int_GetPageInfo(VAddr, &pi) )
+ return;
+
+
+
+}
+
+int MM_Map(tVAddr VAddr, tPAddr PAddr)
+{
+ tMM_PageInfo pi = {0};
+ pi.PhysAddr = PAddr;
+ pi.Size = 12;
+ pi.AP = AP_KRW_ONLY; // Kernel Read/Write
+ pi.bExecutable = 1;
+ if( MM_int_SetPageInfo(VAddr, &pi) ) {
+ MM_DerefPhys(pi.PhysAddr);
+ return 0;
+ }
+ return pi.PhysAddr;
+}
+
+tPAddr MM_Allocate(tVAddr VAddr)
+{
+ tMM_PageInfo pi = {0};
+
+ ENTER("pVAddr", VAddr);
+
+ pi.PhysAddr = MM_AllocPhys();
+ if( pi.PhysAddr == 0 ) LEAVE_RET('i', 0);
+ pi.Size = 12;
+ pi.AP = AP_KRW_ONLY; // Kernel Read/Write
+ pi.bExecutable = 1;
+ if( MM_int_SetPageInfo(VAddr, &pi) ) {
+ MM_DerefPhys(pi.PhysAddr);
+ LEAVE('i', 0);
+ return 0;
+ }
+ LEAVE('x', pi.PhysAddr);
return pi.PhysAddr;
}
+
+void MM_Deallocate(tVAddr VAddr)
+{
+ tMM_PageInfo pi;
+
+ if( MM_int_GetPageInfo(VAddr, &pi) ) return ;
+
+ if( pi.PhysAddr == 0 ) return;
+ MM_DerefPhys(pi.PhysAddr);
+
+ pi.PhysAddr = 0;
+ pi.AP = 0;
+ pi.bExecutable = 0;
+ MM_int_SetPageInfo(VAddr, &pi);
+}
+
+tPAddr MM_ClearUser(void)
+{
+ // TODO: Implement ClearUser
+ return 0;
+}
+
+tVAddr MM_MapTemp(tPAddr PAddr)
+{
+ // TODO: Implement MapTemp
+ return 0;
+}
+
+void MM_FreeTemp(tVAddr VAddr)
+{
+ // TODO: Implement FreeTemp
+}
+
+void MM_DumpTables(tVAddr Start, tVAddr End)
+{
+
+}
+
git.ucc.asn.au / tpg / acess2.git / blobdiff
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