2
* Creation Date: <1999/11/07 19:02:11 samuel>
3
* Time-stamp: <2004/01/07 19:42:36 samuel>
9
* Copyright (C) 1999-2004 Samuel Rydh (samuel@ibrium.se)
10
* Copyright (C) 2004 Stefan Reinauer
12
* This program is free software; you can redistribute it and/or
13
* modify it under the terms of the GNU General Public License
14
* as published by the Free Software Foundation
18
/* TODO: Clean up MOLisms in a decent way */
21
#include "libopenbios/bindings.h"
22
#include "libc/string.h"
23
#include "libopenbios/ofmem.h"
30
#include "asm/processor.h"
32
#include "osi_calls.h"
35
#define BIT(n) (1U<<(31-(n)))
37
/* called from assembly */
38
extern void dsi_exception( void );
39
extern void isi_exception( void );
40
extern void setup_mmu( unsigned long code_base, unsigned long code_size, unsigned long ramsize );
42
/****************************************************************
43
* Memory usage (before of_quiesce is called)
47
* 0x00000000 Exception vectors
48
* 0x00004000 Free space
49
* 0x01e00000 Open Firmware (us)
50
* 0x01f00000 OF allocations
52
* 0x02000000- Free space
54
* Allocations grow downwards from 0x01e00000
56
****************************************************************/
58
#define HASH_SIZE (2 << 15)
59
#define SEGR_BASE 0x400 /* segment number range to use */
61
#define FREE_BASE_1 0x00004000
62
#define OF_CODE_START 0x01e00000
63
/* #define OF_MALLOC_BASE 0x01f00000 */
65
#define OF_MALLOC_BASE _end
67
#define HASH_BASE (0x02000000 - HASH_SIZE)
68
#define FREE_BASE_2 0x02000000
70
#define RAMSIZE 0x02000000 /* XXXXXXXXXXXXXXXXXXX FIXME XXXXXXXXXXXXXXX */
72
static ofmem_t s_ofmem;
74
#define IO_BASE 0x80000000
75
#define OFMEM (&s_ofmem)
77
static inline unsigned long
83
static inline unsigned long
89
static ucell get_heap_top( void )
94
static inline size_t ALIGN_SIZE(size_t x, size_t a)
96
return (x + a - 1) & ~(a-1);
99
ofmem_t* ofmem_arch_get_private(void)
104
void* ofmem_arch_get_malloc_base(void)
106
return OF_MALLOC_BASE;
109
ucell ofmem_arch_get_heap_top(void)
111
return get_heap_top();
114
ucell ofmem_arch_get_virt_top(void)
119
void ofmem_arch_unmap_pages(ucell virt, ucell size)
121
/* kill page mappings in provided range */
124
void ofmem_arch_map_pages(ucell phys, ucell virt, ucell size, ucell mode)
129
/************************************************************************/
130
/* OF private allocations */
131
/************************************************************************/
136
return ofmem_malloc(size);
142
return ofmem_free(ptr);
146
realloc( void *ptr, size_t size )
148
return ofmem_realloc(ptr, size);
152
/************************************************************************/
154
/************************************************************************/
156
ucell ofmem_arch_default_translation_mode( ucell phys )
158
/* XXX: Guard bit not set as it should! */
159
if( phys < IO_BASE || phys >= 0xffc00000 )
160
return 0x02; /*0xa*/ /* wim GxPp */
161
return 0x6a; /* WIm GxPp, I/O */
165
/************************************************************************/
166
/* page fault handler */
167
/************************************************************************/
170
ea_to_phys( ucell ea, ucell *mode )
174
/* hardcode our translation needs */
175
if( ea >= OF_CODE_START && ea < FREE_BASE_2 ) {
176
*mode = ofmem_arch_default_translation_mode( ea );
180
phys = ofmem_translate(ea, mode);
181
if( phys == (ucell)-1 ) {
182
#ifdef I_WANT_MOLISMS
183
if( ea != 0x80816c00 )
184
printk("ea_to_phys: no translation for %08lx, using 1-1\n", ea );
187
*mode = ofmem_arch_default_translation_mode( phys );
189
#ifdef I_WANT_MOLISMS
190
forth_segv_handler( (char*)ea );
193
/* print_virt_range(); */
194
/* print_phys_range(); */
201
hash_page( ucell ea, ucell phys, ucell mode )
203
static int next_grab_slot=0;
204
unsigned long *upte, cmp, hash1;
208
vsid = (ea>>28) + SEGR_BASE;
209
cmp = BIT(0) | (vsid << 7) | ((ea & 0x0fffffff) >> 22);
212
hash1 ^= (ea >> 12) & 0xffff;
213
hash1 &= (get_hash_size() - 1) >> 6;
215
pp = (mPTE_t*)(get_hash_base() + (hash1 << 6));
216
upte = (unsigned long*)pp;
218
/* replace old translation */
219
for( found=0, i=0; !found && i<8; i++ )
220
if( cmp == upte[i*2] )
223
/* otherwise use a free slot */
224
for( i=0; !found && i<8; i++ )
228
/* out of slots, just evict one */
230
i = next_grab_slot + 1;
231
next_grab_slot = (next_grab_slot + 1) % 8;
235
upte[i*2+1] = (phys & ~0xfff) | mode;
237
asm volatile( "tlbie %0" :: "r"(ea) );
241
dsi_exception( void )
243
unsigned long dar, dsisr;
247
asm volatile("mfdar %0" : "=r" (dar) : );
248
asm volatile("mfdsisr %0" : "=r" (dsisr) : );
250
//printk("dsi-exception @ %08lx <%08lx>\n", dar, dsisr );
252
phys = ea_to_phys(dar, &mode);
253
hash_page( dar, phys, mode );
257
isi_exception( void )
259
unsigned long nip, srr1;
263
asm volatile("mfsrr0 %0" : "=r" (nip) : );
264
asm volatile("mfsrr1 %0" : "=r" (srr1) : );
266
//printk("isi-exception @ %08lx <%08lx>\n", nip, srr1 );
268
phys = ea_to_phys(nip, &mode);
269
hash_page( nip, phys, mode );
273
/************************************************************************/
275
/************************************************************************/
278
setup_mmu( unsigned long code_base, unsigned long code_size, unsigned long ramsize )
280
unsigned long sdr1 = HASH_BASE | ((HASH_SIZE-1) >> 16);
281
unsigned long sr_base = (0x20 << 24) | SEGR_BASE;
285
asm volatile("mtsdr1 %0" :: "r" (sdr1) );
286
for( i=0; i<16; i++ ) {
288
asm volatile("mtsrin %0,%1" :: "r" (sr_base + i), "r" (j) );
290
asm volatile("mfmsr %0" : "=r" (msr) : );
291
msr |= MSR_IR | MSR_DR;
292
asm volatile("mtmsr %0" :: "r" (msr) );
298
ofmem_t *ofmem = OFMEM;
299
/* In case we can't rely on memory being zero initialized */
300
memset(ofmem, 0, sizeof(ofmem));
302
ofmem->ramsize = RAMSIZE;
304
ofmem_claim_phys( 0, FREE_BASE_1, 0 );
305
ofmem_claim_virt( 0, FREE_BASE_1, 0 );
306
ofmem_claim_phys( OF_CODE_START, FREE_BASE_2 - OF_CODE_START, 0 );
307
ofmem_claim_virt( OF_CODE_START, FREE_BASE_2 - OF_CODE_START, 0 );