2 #include "ppcmmu/mmu.h"
3 #include "ppcmmu/mmuutil.h"
7 typedef unsigned long ULONG
;
13 0x00400 -- Instruction miss
14 0x10000 -- Entry point
16 0x20000 -- Physical map (PTE + Process Ptr + Address : 16 bytes)
18 4096 / 16 bytes = 256 entries per page
19 256 pages = 1Megabyte = 1 page table page
21 Setup by freeldr and used to build the kernel map, then used by the kernel
38 09 get first usable page
43 MmuTrapHandler callback
[0x30];
44 typedef struct _MmuFreePage
{
46 struct _MmuFreePage
*next
;
48 typedef struct _MmuFreeTree
{
49 struct _MmuFreeTree
*next
;
51 typedef struct _MmuVsidTree
{
52 ppc_map_t
*leaves
[256];
54 typedef struct _MmuVsidInfo
{
56 struct _MmuVsidInfo
*next
;
57 MmuVsidTree
*tree
[256];
59 MmuFreePage
*FreeList
;
60 // Pages are allocated one by one until NextPage == RamSize >> PPC_PAGE_SHIFT
61 // Then we take only from the free list
62 int Clock
= 0, TreeAlloc
= 0, GdbAttach
= 0, Booted
= 0, Vsid
[16];
63 paddr_t RamSize
, FirstUsablePage
, NextPage
;
64 MmuVsidTree
*NextTreePage
= 0;
65 MmuFreeTree
*FreeTree
;
66 MmuVsidInfo
*Segs
[16], *VsidHead
= 0;
68 extern void fmtout(const char *fmt
, ...);
69 int ptegreload(ppc_trap_frame_t
*frame
, vaddr_t addr
);
70 void SerialSetUp(int deviceType
, void *deviceAddr
, int baud
);
71 int SerialInterrupt(int n
, ppc_trap_frame_t
*tf
);
72 void TakeException(int n
, ppc_trap_frame_t
*tf
);
74 int _mmumain(int action
, void *arg1
, void *arg2
, void *arg3
, void *tf
)
76 ppc_trap_frame_t
*trap_frame
= (action
>= 0x100) ? tf
: arg1
;
83 if(!ptegreload(trap_frame
, trap_frame
->dar
))
85 __asm__("mfmsr 3\n\tori 3,3,0x30\n\tmtmsr 3\n\t");
86 if (!callback
[action
](action
,trap_frame
)) TakeException(action
, trap_frame
);
90 if(!ptegreload(trap_frame
, trap_frame
->srr0
))
92 __asm__("mfmsr 3\n\tori 3,3,0x30\n\tmtmsr 3\n\t");
93 if (!callback
[action
](action
,trap_frame
)) TakeException(action
, trap_frame
);
98 /* EE -- Try to get a serial interrupt if debugging enabled, then fall
99 * back to primary handler
101 if (!SerialInterrupt(action
, trap_frame
))
102 callback
[action
](action
, trap_frame
);
104 trap_frame
->srr1
|= 0x8000;
115 if (!callback
[action
](action
,trap_frame
)) TakeException(action
, trap_frame
);
121 trap_frame
->srr1
|= 0x8000;
124 ret
= mmuaddpage(arg1
, (int)arg2
);
127 mmudelpage(arg1
, (int)arg2
);
130 mmusetvsid((int)arg1
, (int)arg2
, (int)arg3
);
133 ret
= (int)callback
[(int)arg1
];
134 callback
[(int)arg1
] = (MmuTrapHandler
)arg2
;
137 mmugetpage(arg1
, (int)arg2
);
143 callkernel(arg1
, arg2
);
146 mmusetramsize((paddr_t
)arg1
);
149 return FirstUsablePage
;
151 mmuallocvsid((int)arg1
, (int)arg2
);
154 mmufreevsid((int)arg1
, (int)arg2
);
158 SerialSetUp((int)arg1
, arg2
, 9600);
161 TakeException((int)arg1
, trap_frame
);
168 /* Restore bats when we were called voluntarily. We may not get a chance
169 * to do this after returning.
171 * At this point, we're in address space that matches physical space.
172 * We turn off mapping, restore bats, then let rfi switch us back to where
175 if (action
>= 0x100) {
178 __asm__("mfmsr %0" : "=r" (tmp
));
180 __asm__("mtmsr %0" : : "r" (tmp
));
182 for(i
= 0; i
< 4; i
++) {
183 SetBat(i
, 0, GetPhys(0xf000 + i
* 16), GetPhys(0xf004 + i
* 16));
184 SetBat(i
, 1, GetPhys(0xf008 + i
* 16), GetPhys(0xf00c + i
* 16));
193 SetPhysByte(0x800003f8, c
);
196 void outstr(const char *str
)
198 while(*str
) outchar(*str
);
203 if(dig
< 10) outchar(dig
+ '0');
204 else outchar(dig
- 10 + 'A');
207 void outnum(unsigned long num
)
210 for( i
= 0; i
< 8; i
++ )
217 void fmtout(const char *str
, ...)
229 else if(str
[1] == 's')
231 outstr(va_arg(ap
, const char *));
235 outnum(va_arg(ap
, int));
248 void mmusetramsize(paddr_t ramsize
)
250 ppc_map_t
*last_map
= &PpcPageTable
[PPC_PAGE_NUMBER(ramsize
)];
254 FirstUsablePage
= (paddr_t
)last_map
;
255 NextPage
= PPC_PAGE_NUMBER(FirstUsablePage
);
259 int ignore(int trapCode
, ppc_trap_frame_t
*trap
)
264 int fpenable(int trapCode
, ppc_trap_frame_t
*trap
)
271 extern int trap_start
[], trap_end
[];
272 void copy_trap_handler(int trap
)
275 paddr_t targetArea
= trap
* 0x100;
277 /* Set target addr */
278 trap_end
[0] = (int)_mmumain
;
280 for (i
= 0; i
<= trap_end
- trap_start
; i
++)
282 SetPhys(targetArea
+ (i
* sizeof(int)), trap_start
[i
]);
290 for(i
= 0; i
< HTABSIZ
/ sizeof(int); i
++)
292 ((int *)HTABORG
)[i
] = 0;
295 /* Default to hang on unknown exception */
296 for(i
= 0; i
< 30; i
++)
298 callback
[i
] = (MmuTrapHandler
)TakeException
;
299 if (i
!= 1) /* Preserve reset handler */
300 copy_trap_handler(i
);
303 /* Serial Interrupt */
304 callback
[5] = SerialInterrupt
;
306 /* Program Exception */
307 callback
[6] = (MmuTrapHandler
)TakeException
;
309 /* Floating point exception */
310 callback
[8] = fpenable
;
312 /* Ignore decrementer and EE */
313 callback
[9] = ignore
;
316 callback
[0x20] = (MmuTrapHandler
)TakeException
;
319 ppc_map_t
*allocpage()
321 MmuFreePage
*FreePage
= 0;
323 if(NextPage
< PPC_PAGE_NUMBER(RamSize
)) {
324 return &PpcPageTable
[NextPage
++];
327 FreeList
= FreeList
->next
;
328 return ((ppc_map_t
*)FreePage
);
332 void freepage(ppc_map_t
*PagePtr
)
334 MmuFreePage
*FreePage
= (MmuFreePage
*)PagePtr
;
335 PagePtr
->proc
= PagePtr
->addr
= 0;
336 FreePage
->next
= FreeList
;
340 MmuVsidTree
*allocvsidtree()
344 MmuVsidTree
*result
= (MmuVsidTree
*)FreeTree
;
345 FreeTree
= FreeTree
->next
;
348 else if(TreeAlloc
>= 3 || !NextTreePage
)
350 ppc_map_t
*map
= allocpage();
351 NextTreePage
= (MmuVsidTree
*)PPC_PAGE_ADDR((map
- PpcPageTable
));
357 return &NextTreePage
[TreeAlloc
++];
361 void freevsidtree(MmuVsidTree
*tree
)
364 for(i
= 0; i
< 256; i
++)
366 freepage(tree
->leaves
[i
]);
367 MmuFreeTree
*NextFreeTree
= (MmuFreeTree
*)tree
;
368 NextFreeTree
->next
= FreeTree
;
369 FreeTree
= NextFreeTree
;
372 void *allocvsid(int vsid
)
374 ppc_map_t
*map
= allocpage();
377 map
->pte
.pteh
= map
->pte
.ptel
= 0;
378 info
= (MmuVsidInfo
*)PPC_PAGE_ADDR((map
- PpcPageTable
));
380 info
->next
= VsidHead
;
385 void mmuallocvsid(int vsid
, int mask
)
388 for(i
= 0; i
< 16; i
++)
391 allocvsid((vsid
<< 4) + i
);
395 MmuVsidInfo
*findvsid(int vsid
)
398 for(info
= VsidHead
; info
; info
= info
->next
)
400 if(info
->vsid
== vsid
) return info
;
405 void freevsid(int vsid
)
408 MmuVsidInfo
*info
= findvsid(vsid
);
410 ppc_map_t
*map
= &PpcPageTable
[PPC_PAGE_NUMBER((paddr_t
)info
)];
411 for(i
= 0; i
< 256; i
++)
414 freevsidtree(info
->tree
[i
]);
419 void mmufreevsid(int vsid
, int mask
)
422 for(i
= 0; i
< 16; i
++)
425 freevsid((vsid
<< 4) + i
);
429 int mmuaddpage(ppc_map_info_t
*info
, int count
)
431 int i
, iva
= 0, vsid
, phys
, virt
;
433 int ptelo
, vsid_table_hi
, vsid_table_lo
;
435 MmuVsidInfo
*VsidInfo
;
436 MmuVsidTree
*VsidTree
;
438 for(i
= 0; i
< count
; i
++)
441 vsid
= ((info
[i
].addr
>> 28) & 15) | (info
[i
].proc
<< 4);
442 VsidInfo
= findvsid(vsid
);
444 if(!VsidInfo
) return -1;
446 ptehi
= (1 << 31) | (vsid
<< 7) | ((virt
>> 22) & 0x3f);
449 PagePtr
= &PpcPageTable
[PPC_PAGE_NUMBER(info
[i
].phys
)];
451 PagePtr
= allocpage();
458 phys
= PPC_PAGE_ADDR((PagePtr
- PpcPageTable
));
459 ptelo
= phys
& ~PPC_PAGE_MASK
;
461 /* Update page data */
462 PagePtr
->pte
.pteh
= ptehi
;
463 PagePtr
->pte
.ptel
= ptelo
;
464 PagePtr
->proc
= info
[i
].proc
;
465 PagePtr
->addr
= virt
;
467 vsid_table_hi
= virt
>> 20 & 255;
468 vsid_table_lo
= virt
>> 12 & 255;
470 if(!VsidInfo
->tree
[vsid_table_hi
])
471 VsidInfo
->tree
[vsid_table_hi
] = allocvsidtree();
472 VsidTree
= VsidInfo
->tree
[vsid_table_hi
];
473 if(!VsidTree
) return 0;
474 VsidTree
->leaves
[vsid_table_lo
] = PagePtr
;
476 __asm__("tlbie %0\n\tsync\n\tisync" : : "r" (iva
));
481 ppc_pteg_t
*PtegFromPage(ppc_map_t
*map
, int hfun
)
483 if(!map
->proc
&& !map
->addr
) return 0;
484 return &PpcHashedPTE
[PtegNumber(map
->addr
, hfun
)];
487 int PageMatch(vaddr_t addr
, ppc_pte_t pte
)
489 int vsid_pte
= (pte
.pteh
>> 7) & 15, api_pte
= pte
.pteh
& 63;
491 (((addr
>> 28) & 15) == vsid_pte
) &&
492 (((addr
>> 22) & 63) == api_pte
);
495 ppc_map_t
*mmuvirtmap(vaddr_t addr
)
497 int seg
= (addr
>> 28) & 15;
498 MmuVsidInfo
*seginfo
= Segs
[seg
];
499 MmuVsidTree
*segtree
= 0;
500 if(!seginfo
) return 0;
501 segtree
= seginfo
->tree
[(addr
>> 20) & 255];
502 if(!segtree
) return 0;
503 return segtree
->leaves
[(addr
>> 12) & 255];
506 void mmudelpage(ppc_map_info_t
*info
, int count
)
510 ppc_pteg_t
*PageEntry
;
511 ppc_pte_t ZeroPte
= { 0 };
513 for(i
= 0; i
< count
; i
++)
518 PagePtr
= &PpcPageTable
[ipa
];
519 info
[i
].proc
= PagePtr
->proc
;
520 info
[i
].addr
= PagePtr
->addr
;
524 PagePtr
= mmuvirtmap(info
[i
].addr
);
525 ipa
= PPC_PAGE_ADDR(PagePtr
- PpcPageTable
);
528 for(j
= 0; j
< 2; j
++)
530 PageEntry
= PtegFromPage(PagePtr
, j
);
531 for(k
= 0; k
< 8; k
++)
533 if(PageMatch(ipa
, PageEntry
->block
[k
]))
535 if(PageEntry
->block
[k
].ptel
& 0x100)
536 info
[i
].flags
|= MMU_PAGE_DIRTY
;
537 PageEntry
->block
[k
] = ZeroPte
;
542 __asm__("tlbie %0\n\tsync\n\tisync" : : "r" (info
[i
].addr
));
546 void mmugetpage(ppc_map_info_t
*info
, int count
)
551 for( i
= 0; i
< count
; i
++ )
553 if(!info
[i
].addr
&& !info
[i
].proc
)
555 PagePtr
= &((ppc_map_t
*)PAGETAB
)[info
[i
].phys
];
556 info
[i
].proc
= PagePtr
->proc
;
557 info
[i
].addr
= PagePtr
->addr
;
558 info
[i
].flags
= MMU_ALL_RW
;
560 vaddr_t addr
= info
[i
].addr
;
561 int vsid
= ((addr
>> 28) & 15) | (info
[i
].proc
<< 4);
562 PagePtr
= mmuvirtmap(info
[i
].addr
);
567 info
[i
].phys
= PPC_PAGE_ADDR(PagePtr
- PpcPageTable
);
568 info
[i
].flags
= MMU_ALL_RW
; // HACK
574 void mmusetvsid(int start
, int end
, int vsid
)
577 for(i
= start
; i
< end
; i
++)
579 s_vsid
= (vsid
<< 4) | (i
& 15);
580 sr
= (GetSR(i
) & ~PPC_VSID_MASK
) | s_vsid
;
583 Segs
[i
] = findvsid(s_vsid
);
588 int ptegreload(ppc_trap_frame_t
*frame
, vaddr_t addr
)
590 int hfun
= (Clock
>> 3) & 1, ptegnum
= PtegNumber(addr
, hfun
);
591 ppc_map_t
*map
= mmuvirtmap(addr
);
593 map
->pte
.pteh
= (map
->pte
.pteh
& ~64) | (hfun
<< 6);
594 PpcHashedPTE
[ptegnum
].block
[Clock
& 7] = map
->pte
;
596 fmtout("Reloading addr %x (phys %x) at %x[%x] (%x:%x)\r\n",
597 addr
, PPC_PAGE_ADDR(map
- PpcPageTable
), ptegnum
, Clock
& 15,
598 PpcHashedPTE
[ptegnum
].block
[Clock
&7].pteh
,
599 PpcHashedPTE
[ptegnum
].block
[Clock
&7].ptel
);
602 __asm__("tlbie %0\n\tsync\n\tisync" : : "r" (addr
));
606 void callkernel(void *fun_ptr
, void *arg
)
612 for (i
= 0; i
< 16; i
++)
614 // Patch up the vsid map. We shouldn't muck with these until we're
616 mmusetvsid(i
, i
+1, Vsid
[i
]);
619 void (*fun
)(void *) = fun_ptr
;
620 __asm__("mfmsr 3\n\t"
628 : : "r" (HTABORG
), "r" (arg
), "r" (fun
));