* ARM7 Virtual Memory Manager
* - arch/arm7/mm_virt.c
*/
+#include <acess.h>
#include <mm_virt.h>
+#define AP_KRW_ONLY 0x1
+#define AP_KRO_ONLY 0x5
+#define AP_RW_BOTH 0x3
+#define AP_RO_BOTH 0x6
+
// === TYPES ===
typedef struct
{
tPAddr PhysAddr;
Uint8 Size;
Uint8 Domain;
+ BOOL bExecutable;
+ BOOL bGlobal;
+ BOOL bShared;
+ int AP;
} tMM_PageInfo;
+// === PROTOTYPES ===
+ 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_SetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
+{
+ Uint32 *table0, *table1;
+ Uint32 *desc;
+
+ if(VAddr & 0x80000000 ) {
+ table0 = (void*)MM_TABLE0KERN; // Level 0
+ table1 = (void*)MM_TABLE1KERN; // Level 1
+ }
+ else {
+ table0 = (void*)MM_TABLE0USER;
+ table1 = (void*)MM_TABLE1USER;
+ }
+ VAddr &= 0x7FFFFFFF;
+
+ desc = &table0[ VAddr >> 20 ];
+
+ switch(pi->Size)
+ {
+ case 12: // Small Page
+ case 16: // Large Page
+ if( (*desc & 3) == 0 ) {
+ if( pi->PhysAddr == 0 ) return 0;
+ // Allocate
+ *desc = MM_AllocPhys();
+ *desc |= pi->Domain << 5;
+ *desc |= 1;
+ }
+ desc = &table1[ VAddr >> 12 ];
+ if( pi->Size == 12 )
+ {
+ // Small page
+ // - Error if overwriting a large page
+ if( (*desc & 3) == 1 ) return 1;
+ if( pi->PhysAddr == 0 ) {
+ *desc = 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
+ }
+ else
+ {
+ // Large page
+ // TODO:
+ }
+ break;
+ case 20: // Section or unmapped
+ Log_Warning("MM", "TODO: Implement sections");
+ break;
+ case 24: // Supersection
+ // Error if not aligned
+ if( VAddr & 0xFFFFFF ) {
+ return 1;
+ }
+ if( (*desc & 3) == 0 || ((*desc & 3) == 2 && (*desc & (1 << 18))) )
+ {
+ if( pi->PhysAddr == 0 ) {
+ *desc = 0;
+ // TODO: Apply to all entries
+ 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
+ return 0;
+ }
+ return 1;
+ }
+
+ return 1;
}
int MM_int_GetPageInfo(tVAddr VAddr, tMM_PageInfo *pi)
{
- Uint32 *table0, table1;
+ Uint32 *table0, *table1;
Uint32 desc;
if(VAddr & 0x80000000 ) {
- table0 = MM_TABLE0KERN;
- table1 = MM_TABLE1KERN;
+ table0 = (void*)MM_TABLE0KERN; // Level 0
+ table1 = (void*)MM_TABLE1KERN; // Level 1
}
else {
- table0 = MM_TABLE0USER;
- table1 = MM_TABLE1USER;
+ table0 = (void*)MM_TABLE0USER;
+ table1 = (void*)MM_TABLE1USER;
}
- VAddr & 0x7FFFFFFF;
+ VAddr &= 0x7FFFFFFF;
desc = table0[ VAddr >> 20 ];
+
+ pi->bExecutable = 1;
+ pi->bGlobal = 0;
+ pi->bShared = 0;
switch( (desc & 3) )
{
pi->PhysAddr = desc & 0xFFFFF000;
pi->bExecutable = desc & 1;
pi->bGlobal = !(desc >> 11);
- pi->bSharec = (desc >> 10) & 1;
+ pi->bShared = (desc >> 10) & 1;
return 1;
}
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 ---
return 0;
return pi.PhysAddr;
}
+
+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};
+
+ pi.PhysAddr = MM_AllocPhys();
+ if( pi.PhysAddr == 0 ) return 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);
+ return 0;
+ }
+ 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);
+}
git.ucc.asn.au / tpg / acess2.git / blobdiff
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