4 * Virtual Memory Manager
15 #define PADDR_MASK 0x7FFFFFFF##FFFFF000
17 #define PF_PRESENT 0x1
21 #define PF_PAGED 0x400
22 #define PF_NX 0x80000000##00000000
25 #define PAGETABLE(idx) (*((tPAddr*)MM_FRACTAL_BASE+(idx)))
26 #define PAGEDIR(idx) PAGETABLE((MM_FRACTAL_BASE>>12)+((idx)&0x7FFFFFF))
27 #define PAGEDIRPTR(idx) PAGEDIR((MM_FRACTAL_BASE>>21)+((idx)&0x3FFFF))
28 #define PAGEMAPLVL4(idx) PAGEDIRPTR((MM_FRACTAL_BASE>>30)+((idx)&0x1FF))
33 void MM_InitVirt(void)
38 void MM_FinishVirtualInit(void)
44 * \brief Map a physical page to a virtual one
46 int MM_Map(tVAddr VAddr, tPAddr PAddr)
50 Log("MM_Map: (VAddr=0x%x, PAddr=0x%x)", VAddr, PAddr);
53 if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
57 PAGEMAPLVL4(VAddr >> 39) = tmp | 3;
58 memset( &PAGEDIRPTR( (VAddr>>39)<<9 ), 0, 4096 );
62 if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
66 PAGEDIRPTR(VAddr >> 30) = tmp | 3;
67 memset( &PAGEDIR( (VAddr>>30)<<9 ), 0, 4096 );
71 if( !(PAGEDIR(VAddr >> 21) & 1) )
75 PAGEDIR(VAddr >> 21) = tmp | 3;
76 memset( &PAGETABLE( (VAddr>>21)<<9 ), 0, 4096 );
79 // Check if this virtual address is already mapped
80 if( PAGETABLE(VAddr >> 12) & 1 )
83 PAGETABLE(VAddr >> 12) = PAddr | 3;
89 * \brief Removed a mapped page
91 void MM_Unmap(tVAddr VAddr)
94 if( !(PAGEMAPLVL4(VAddr >> 39) & 1) ) return ;
96 if( !(PAGEDIRPTR(VAddr >> 30) & 1) ) return ;
98 if( !(PAGEDIR(VAddr >> 21) & 1) ) return ;
100 PAGETABLE(VAddr >> 12) = 0;
104 * \brief Allocate a block of memory at the specified virtual address
106 tPAddr MM_Allocate(tVAddr VAddr)
110 Log("MM_Allocate: (VAddr=%x)", VAddr);
111 Log("MM_Allocate: MM_AllocPhys()");
112 ret = MM_AllocPhys();
113 Log("MM_Allocate: ret = %x", ret);
116 if( !MM_Map(VAddr, ret) )
118 Warning("MM_Allocate: Unable to map", ret);
126 void MM_Deallocate(tVAddr VAddr)
130 phys = MM_GetPhysAddr(VAddr);
139 * \brief Get the physical address of a virtual location
141 tPAddr MM_GetPhysAddr(tVAddr Addr)
143 Log("MM_GetPhysAddr: (Addr=0x%x)", Addr);
144 if( !(PAGEMAPLVL4(Addr >> 39) & 1) )
146 Log(" MM_GetPhysAddr: PDP Valid");
147 if( !(PAGEDIRPTR(Addr >> 30) & 1) )
149 Log(" MM_GetPhysAddr: PD Valid");
150 if( !(PAGEDIR(Addr >> 21) & 1) )
152 Log(" MM_GetPhysAddr: PT Valid");
153 if( !(PAGETABLE(Addr >> 12) & 1) )
155 Log(" MM_GetPhysAddr: Page Valid");
157 return (PAGETABLE(Addr >> 12) & ~0xFFF) | (Addr & 0xFFF);
161 * \brief Sets the flags on a page
163 void MM_SetFlags(tVAddr VAddr, Uint Flags, Uint Mask)
168 if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
170 if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
172 if( !(PAGEDIR(VAddr >> 21) & 1) )
174 if( !(PAGETABLE(VAddr >> 12) & 1) )
178 ent = &PAGETABLE(VAddr >> 12);
181 if( Mask & MM_PFLAG_RO )
183 if( Flags & MM_PFLAG_RO ) {
192 if( Mask & MM_PFLAG_KERNEL )
194 if( Flags & MM_PFLAG_KERNEL ) {
203 if( Mask & MM_PFLAG_COW )
205 if( Flags & MM_PFLAG_COW ) {
216 if( Mask & MM_PFLAG_EXEC )
218 if( Flags & MM_PFLAG_EXEC ) {
228 * \brief Get the flags applied to a page
230 Uint MM_GetFlags(tVAddr VAddr)
236 if( !(PAGEMAPLVL4(VAddr >> 39) & 1) )
238 if( !(PAGEDIRPTR(VAddr >> 30) & 1) )
240 if( !(PAGEDIR(VAddr >> 21) & 1) )
242 if( !(PAGETABLE(VAddr >> 12) & 1) )
246 ent = &PAGETABLE(VAddr >> 12);
249 if( !(*ent & PF_WRITE) ) ret |= MM_PFLAG_RO;
251 if( !(*ent & PF_USER) ) ret |= MM_PFLAG_KERNEL;
253 if( *ent & PF_COW ) ret |= MM_PFLAG_COW;
255 if( !(*ent & PF_NX) ) ret |= MM_PFLAG_EXEC;
260 // --- Hardware Mappings ---
262 * \brief Map a range of hardware pages
264 tVAddr MM_MapHWPages(tPAddr PAddr, Uint Number)
266 Log_KernelPanic("MM", "TODO: Implement MM_MapHWPages");
271 * \brief Free a range of hardware pages
273 void MM_UnmapHWPages(tVAddr VAddr, Uint Number)
275 Log_KernelPanic("MM", "TODO: Implement MM_UnmapHWPages");
278 // --- Tempory Mappings ---
279 tVAddr MM_MapTemp(tPAddr PAddr)
281 Log_KernelPanic("MM", "TODO: Implement MM_MapTemp");
285 void MM_FreeTemp(tVAddr VAddr)
287 Log_KernelPanic("MM", "TODO: Implement MM_FreeTemp");
292 // --- Address Space Clone --
293 tPAddr MM_Clone(void)
297 // #1 Create a copy of the PML4
298 ret = MM_AllocPhys();
301 // #2 Alter the fractal pointer
302 // #3 Set Copy-On-Write to all user pages
307 void MM_ClearUser(void)
310 // #1 Traverse the structure < 2^47, Deref'ing all pages
311 // #2 Free tables/dirs/pdps once they have been cleared
313 for( addr = 0; addr < 0x800000000000; )
315 if( PAGEMAPLVL4(addr >> PML4_SHIFT) & 1 )
317 if( PAGEDIRPTR(addr >> PDP_SHIFT) & 1 )
319 if( PAGEDIR(addr >> PDIR_SHIFT) & 1 )
322 if( PAGETABLE(addr >> PTAB_SHIFT) & 1 ) {
323 MM_DerefPhys( PAGETABLE(addr >> PTAB_SHIFT) & PADDR_MASK );
324 PAGETABLE(addr >> PTAB_SHIFT) = 0;
326 addr += 1 << PTAB_SHIFT;
327 // Dereference the PDIR Entry
328 if( (addr + (1 << PTAB_SHIFT)) >> PDIR_SHIFT != (addr >> PDIR_SHIFT) ) {
329 MM_DerefPhys( PAGEMAPLVL4(addr >> PDIR_SHIFT) & PADDR_MASK );
330 PAGEDIR(addr >> PDIR_SHIFT) = 0;
334 addr += 1 << PDIR_SHIFT;
337 // Dereference the PDP Entry
338 if( (addr + (1 << PDIR_SHIFT)) >> PDP_SHIFT != (addr >> PDP_SHIFT) ) {
339 MM_DerefPhys( PAGEMAPLVL4(addr >> PDP_SHIFT) & PADDR_MASK );
340 PAGEDIRPTR(addr >> PDP_SHIFT) = 0;
344 addr += 1 << PDP_SHIFT;
347 // Dereference the PML4 Entry
348 if( (addr + (1 << PDP_SHIFT)) >> PML4_SHIFT != (addr >> PML4_SHIFT) ) {
349 MM_DerefPhys( PAGEMAPLVL4(addr >> PML4_SHIFT) & PADDR_MASK );
350 PAGEMAPLVL4(addr >> PML4_SHIFT) = 0;
354 addr += (tVAddr)1 << PML4_SHIFT;
360 tVAddr MM_NewWorkerStack(void)
365 tVAddr MM_NewKStack(void)