+++ /dev/null
-/*
- * Acess2
- *
- * 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);
-tVAddr MM_NewKStack(int bGlobal);
-
-// === GLOBALS ===
-
-// === CODE ===
-int MM_InitialiseVirtual(void)
-{
- return 0;
-}
-
-void MM_int_GetTables(tVAddr VAddr, Uint32 **Table0, Uint32 **Table1)
-{
- if(VAddr & 0x80000000) {
- *Table0 = (void*)&kernel_table0; // Level 0
- *Table1 = (void*)MM_TABLE1KERN; // Level 1
- }
- else {
- *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;
- }
-
- 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
- case 0:
- pi->PhysAddr = 0;
- pi->Size = 20;
- pi->Domain = 0;
- return 1;
-
- // 1: Coarse page table
- case 1:
- // Domain from top level table
- 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
- case 0:
- pi->Size = 12;
- return 1;
- // 1: Large Page (64KiB)
- case 1:
- pi->Size = 16;
- pi->PhysAddr = desc & 0xFFFF0000;
- return 0;
- // 2/3: Small page
- case 2:
- case 3:
- pi->Size = 12;
- pi->PhysAddr = desc & 0xFFFFF000;
- pi->bExecutable = desc & 1;
- pi->bGlobal = !(desc >> 11);
- pi->bShared = (desc >> 10) & 1;
- return 0;
- }
- return 1;
-
- // 2: Section (or Supersection)
- case 2:
- if( desc & (1 << 18) ) {
- // Supersection
- pi->PhysAddr = desc & 0xFF000000;
- 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;
- }
-
- // Section
- pi->PhysAddr = desc & 0xFFF80000;
- pi->Size = 20;
- pi->Domain = (desc >> 5) & 7;
- return 0;
-
- // 3: Reserved (invalid)
- case 3:
- pi->PhysAddr = 0;
- pi->Size = 20;
- pi->Domain = 0;
- return 2;
- }
- return 2;
-}
-
-// --- Exports ---
-tPAddr MM_GetPhysAddr(tVAddr VAddr)
-{
- 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
-}
-
-tVAddr MM_NewKStack(int bGlobal)
-{
- // TODO: Implement NewKStack
- // TODO: Should I support global stacks? if only for the idle thread
- return 0;
-}
-
-void MM_DumpTables(tVAddr Start, tVAddr End)
-{
-
-}
-
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