WebSVN – HelenOS – Diff – //kernel/trunk/arch/ppc32/src/mm/page.c


/*
 * Copyright (C) 2005 Martin Decky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#include <arch/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <arch/mm/frame.h>
#include <arch/asm.h>
#include <mm/frame.h>
#include <mm/page.h>
#include <mm/as.h>
#include <arch.h>
#include <arch/types.h>
#include <arch/exception.h>
#include <align.h>
#include <config.h>
#include <print.h>
#include <symtab.h>
 
static phte_t *phte;
 
 
/** Try to find PTE for faulting address
 *
 * Try to find PTE for faulting address.
 * The as->lock must be held on entry to this function
 * if lock is true.
 *
 * @param as       Address space.
 * @param lock     Lock/unlock the address space.
 * @param badvaddr Faulting virtual address.
 * @param istate   Pointer to interrupted state.
 * @param pfrc     Pointer to variable where as_page_fault() return code will be stored.
 * @return         PTE on success, NULL otherwise.
 *
 */
static pte_t *find_mapping_and_check(as_t *as, bool lock, __address badvaddr, istate_t *istate, int *pfcr)
{
    /*
     * Check if the mapping exists in page tables.
     */
    pte_t *pte = page_mapping_find(as, badvaddr);
    if ((pte) && (pte->p)) {
        /*
         * Mapping found in page tables.
         * Immediately succeed.
         */
        return pte;
    } else {
        int rc;
   
        /*
         * Mapping not found in page tables.
         * Resort to higher-level page fault handler.
         */
        page_table_unlock(as, lock);
        switch (rc = as_page_fault(badvaddr, istate)) {
            case AS_PF_OK:
                /*
                 * The higher-level page fault handler succeeded,
                 * The mapping ought to be in place.
                 */
                page_table_lock(as, lock);
                pte = page_mapping_find(as, badvaddr);
                ASSERT((pte) && (pte->p));
                return pte;
            case AS_PF_DEFER:
                page_table_lock(as, lock);
                *pfcr = rc;
                return NULL;
            case AS_PF_FAULT:
                page_table_lock(as, lock);
                printf("Page fault.\n");
                *pfcr = rc;
                return NULL;
            default:
                panic("unexpected rc (%d)\n", rc);
        }  
    }
}
 
 
static void pht_refill_fail(__address badvaddr, istate_t *istate)
{
    char *symbol = "";
    char *sym2 = "";
 
    char *s = get_symtab_entry(istate->pc);
    if (s)
        symbol = s;
    s = get_symtab_entry(istate->lr);
    if (s)
        sym2 = s;
    panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
}
 
 
static void pht_insert(const __address vaddr, const pfn_t pfn)
{
    __u32 page = (vaddr >> 12) & 0xffff;
    __u32 api = (vaddr >> 22) & 0x3f;
    __u32 vsid;
   
    asm volatile (
        "mfsrin %0, %1\n"
        : "=r" (vsid)
        : "r" (vaddr)
    );
   
    /* Primary hash (xor) */
    __u32 h = 0;
    __u32 hash = vsid ^ page;
    __u32 base = (hash & 0x3ff) << 3;
    __u32 i;
    bool found = false;
   
    /* Find unused or colliding
       PTE in PTEG */
    for (i = 0; i < 8; i++) {
        if ((!phte[base + i].v) || ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
            found = true;
            break;
        }
    }
   
    if (!found) {
        /* Secondary hash (not) */
        __u32 base2 = (~hash & 0x3ff) << 3;
       
        /* Find unused or colliding
           PTE in PTEG */
        for (i = 0; i < 8; i++) {
            if ((!phte[base2 + i].v) || ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
                found = true;
                base = base2;
                h = 1;
                break;
            }
        }
       
        if (!found) {
            // TODO: A/C precedence groups
            i = page % 8;
        }
    }
   
    phte[base + i].v = 1;
    phte[base + i].vsid = vsid;
    phte[base + i].h = h;
    phte[base + i].api = api;
    phte[base + i].rpn = pfn;
    phte[base + i].r = 0;
    phte[base + i].c = 0;
    phte[base + i].pp = 2; // FIXME
}
 
 
/** Process Instruction/Data Storage Interrupt
 *
 * @param data   True if Data Storage Interrupt.
 * @param istate Interrupted register context.
 *
 */
void pht_refill(bool data, istate_t *istate)
{
    __address badvaddr;
    pte_t *pte;
    int pfcr;
    as_t *as;
    bool lock;
   
    if (AS == NULL) {
        as = AS_KERNEL;
        lock = false;
    } else {
        as = AS;
        lock = true;
    }
   
    if (data) {
        asm volatile (
            "mfdar %0\n"
            : "=r" (badvaddr)
        );
    } else
        badvaddr = istate->pc;
       
    page_table_lock(as, lock);
   
    pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr);
    if (!pte) {
        switch (pfcr) {
            case AS_PF_FAULT:
                goto fail;
                break;
            case AS_PF_DEFER:
                /*
                 * The page fault came during copy_from_uspace()
                 * or copy_to_uspace().
                 */
                page_table_unlock(as, lock);
                return;
            default:
                panic("Unexpected pfrc (%d)\n", pfcr);
        }
    }
   
    pte->a = 1; /* Record access to PTE */
    pht_insert(badvaddr, pte->pfn);
   
    page_table_unlock(as, lock);
    return;
   
fail:
    page_table_unlock(as, lock);
    pht_refill_fail(badvaddr, istate);
}
 
 
void pht_init(void)
{
    memsetb((__address) phte, 1 << PHT_BITS, 0);
}
 
 
void page_arch_init(void)
{
    if (config.cpu_active == 1) {
        page_mapping_operations = &pt_mapping_operations;
       
        __address cur;
        int flags;
       
        /* Frames below 128 MB are mapped using BAT,
           map rest of the physical memory */
        for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
            flags = PAGE_CACHEABLE;
            if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
                flags |= PAGE_GLOBAL;
            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
        }
       
        /* Allocate page hash table */
        phte_t *physical_phte = (phte_t *) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA | FRAME_PANIC));
        phte = (phte_t *) PA2KA((__address) physical_phte);
       
        ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
        pht_init();
       
        asm volatile (
            "mtsdr1 %0\n"
            :
            : "r" ((__address) physical_phte)
        );
    }
}
 
 
__address hw_map(__address physaddr, size_t size)
{
    if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
        panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
   
    __address virtaddr = PA2KA(last_frame);
    pfn_t i;
    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
   
    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
   
    return virtaddr;
}
 

Rev 1389	Rev 1390
1	/*	1	/*
2	* Copyright (C) 2005 Martin Decky	2	* Copyright (C) 2005 Martin Decky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <arch/mm/page.h>	29	#include <arch/mm/page.h>
30	#include <genarch/mm/page_pt.h>	30	#include <genarch/mm/page_pt.h>
31	#include <arch/mm/frame.h>	31	#include <arch/mm/frame.h>
32	#include <arch/asm.h>	32	#include <arch/asm.h>
33	#include <mm/frame.h>	33	#include <mm/frame.h>
34	#include <mm/page.h>	34	#include <mm/page.h>
35	#include <mm/as.h>	35	#include <mm/as.h>
36	#include <arch.h>	36	#include <arch.h>
37	#include <arch/types.h>	37	#include <arch/types.h>
38	#include <arch/exception.h>	38	#include <arch/exception.h>
39	#include <align.h>	39	#include <align.h>
40	#include <config.h>	40	#include <config.h>
41	#include <print.h>	41	#include <print.h>
42	#include <symtab.h>	42	#include <symtab.h>
43		43
44	static phte_t *phte;	44	static phte_t *phte;
45		45
46		46
47	/** Try to find PTE for faulting address	47	/** Try to find PTE for faulting address
48	*	48	*
49	* Try to find PTE for faulting address.	49	* Try to find PTE for faulting address.
50	* The as->lock must be held on entry to this function	50	* The as->lock must be held on entry to this function
51	* if lock is true.	51	* if lock is true.
52	*	52	*
53	* @param as Address space.	53	* @param as Address space.
54	* @param lock Lock/unlock the address space.	54	* @param lock Lock/unlock the address space.
55	* @param badvaddr Faulting virtual address.	55	* @param badvaddr Faulting virtual address.
56	* @param istate Pointer to interrupted state.	56	* @param istate Pointer to interrupted state.
57	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.	57	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.
58	* @return PTE on success, NULL otherwise.	58	* @return PTE on success, NULL otherwise.
59	*	59	*
60	*/	60	*/
61	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, istate_t istate, int pfcr)	61	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, istate_t istate, int pfcr)
62	{	62	{
63	/*	63	/*
64	* Check if the mapping exists in page tables.	64	* Check if the mapping exists in page tables.
65	*/	65	*/
66	pte_t *pte = page_mapping_find(as, badvaddr);	66	pte_t *pte = page_mapping_find(as, badvaddr);
67	if ((pte) && (pte->p)) {	67	if ((pte) && (pte->p)) {
68	/*	68	/*
69	* Mapping found in page tables.	69	* Mapping found in page tables.
70	* Immediately succeed.	70	* Immediately succeed.
71	*/	71	*/
72	return pte;	72	return pte;
73	} else {	73	} else {
74	int rc;	74	int rc;
75		75
76	/*	76	/*
77	* Mapping not found in page tables.	77	* Mapping not found in page tables.
78	* Resort to higher-level page fault handler.	78	* Resort to higher-level page fault handler.
79	*/	79	*/
80	page_table_unlock(as, lock);	80	page_table_unlock(as, lock);
81	switch (rc = as_page_fault(badvaddr, istate)) {	81	switch (rc = as_page_fault(badvaddr, istate)) {
82	case AS_PF_OK:	82	case AS_PF_OK:
83	/*	83	/*
84	* The higher-level page fault handler succeeded,	84	* The higher-level page fault handler succeeded,
85	* The mapping ought to be in place.	85	* The mapping ought to be in place.
86	*/	86	*/
87	page_table_lock(as, lock);	87	page_table_lock(as, lock);
88	pte = page_mapping_find(as, badvaddr);	88	pte = page_mapping_find(as, badvaddr);
89	ASSERT((pte) && (pte->p));	89	ASSERT((pte) && (pte->p));
90	return pte;	90	return pte;
91	case AS_PF_DEFER:	91	case AS_PF_DEFER:
92	page_table_lock(as, lock);	92	page_table_lock(as, lock);
93	*pfcr = rc;	93	*pfcr = rc;
94	return NULL;	94	return NULL;
95	case AS_PF_FAULT:	95	case AS_PF_FAULT:
96	page_table_lock(as, lock);	96	page_table_lock(as, lock);
97	printf("Page fault.\n");	97	printf("Page fault.\n");
98	*pfcr = rc;	98	*pfcr = rc;
99	return NULL;	99	return NULL;
100	default:	100	default:
101	panic("unexpected rc (%d)\n", rc);	101	panic("unexpected rc (%d)\n", rc);
102	}	102	}
103	}	103	}
104	}	104	}
105		105
106		106
107	static void pht_refill_fail(__address badvaddr, istate_t *istate)	107	static void pht_refill_fail(__address badvaddr, istate_t *istate)
108	{	108	{
109	char *symbol = "";	109	char *symbol = "";
110	char *sym2 = "";	110	char *sym2 = "";
111		111
112	char *s = get_symtab_entry(istate->pc);	112	char *s = get_symtab_entry(istate->pc);
113	if (s)	113	if (s)
114	symbol = s;	114	symbol = s;
115	s = get_symtab_entry(istate->lr);	115	s = get_symtab_entry(istate->lr);
116	if (s)	116	if (s)
117	sym2 = s;	117	sym2 = s;
118	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);	118	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
119	}	119	}
120		120
121		121
122	static void pht_insert(const __address vaddr, const pfn_t pfn)	122	static void pht_insert(const __address vaddr, const pfn_t pfn)
123	{	123	{
124	__u32 page = (vaddr >> 12) & 0xffff;	124	__u32 page = (vaddr >> 12) & 0xffff;
125	__u32 api = (vaddr >> 22) & 0x3f;	125	__u32 api = (vaddr >> 22) & 0x3f;
126	__u32 vsid;	126	__u32 vsid;
127		127
128	asm volatile (	128	asm volatile (
129	"mfsrin %0, %1\n"	129	"mfsrin %0, %1\n"
130	: "=r" (vsid)	130	: "=r" (vsid)
131	: "r" (vaddr)	131	: "r" (vaddr)
132	);	132	);
133		133
134	/* Primary hash (xor) */	134	/* Primary hash (xor) */
135	__u32 h = 0;	135	__u32 h = 0;
136	__u32 hash = vsid ^ page;	136	__u32 hash = vsid ^ page;
137	__u32 base = (hash & 0x3ff) << 3;	137	__u32 base = (hash & 0x3ff) << 3;
138	__u32 i;	138	__u32 i;
139	bool found = false;	139	bool found = false;
140		140
141	/* Find unused or colliding	141	/* Find unused or colliding
142	PTE in PTEG */	142	PTE in PTEG */
143	for (i = 0; i < 8; i++) {	143	for (i = 0; i < 8; i++) {
144	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {	144	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
145	found = true;	145	found = true;
146	break;	146	break;
147	}	147	}
148	}	148	}
149		149
150	if (!found) {	150	if (!found) {
151	/* Secondary hash (not) */	151	/* Secondary hash (not) */
152	__u32 base2 = (~hash & 0x3ff) << 3;	152	__u32 base2 = (~hash & 0x3ff) << 3;
153		153
154	/* Find unused or colliding	154	/* Find unused or colliding
155	PTE in PTEG */	155	PTE in PTEG */
156	for (i = 0; i < 8; i++) {	156	for (i = 0; i < 8; i++) {
157	if (!phte[base2 + i].v) {	157	if ((!phte[base2 + i].v) \|\| ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
158	found = true;	158	found = true;
159	base = base2;	159	base = base2;
160	h = 1;	160	h = 1;
161	break;	161	break;
162	}	162	}
163	}	163	}
164		164
165	if (!found) {	165	if (!found) {
166	// TODO: A/C precedence groups	166	// TODO: A/C precedence groups
167	i = page % 8;	167	i = page % 8;
168	}	168	}
169	}	169	}
170		170
171	phte[base + i].v = 1;	171	phte[base + i].v = 1;
172	phte[base + i].vsid = vsid;	172	phte[base + i].vsid = vsid;
173	phte[base + i].h = h;	173	phte[base + i].h = h;
174	phte[base + i].api = api;	174	phte[base + i].api = api;
175	phte[base + i].rpn = pfn;	175	phte[base + i].rpn = pfn;
176	phte[base + i].r = 0;	176	phte[base + i].r = 0;
177	phte[base + i].c = 0;	177	phte[base + i].c = 0;
178	phte[base + i].pp = 2; // FIXME	178	phte[base + i].pp = 2; // FIXME
179	}	179	}
180		180
181		181
182	/** Process Instruction/Data Storage Interrupt	182	/** Process Instruction/Data Storage Interrupt
183	*	183	*
184	* @param data True if Data Storage Interrupt.	184	* @param data True if Data Storage Interrupt.
185	* @param istate Interrupted register context.	185	* @param istate Interrupted register context.
186	*	186	*
187	*/	187	*/
188	void pht_refill(bool data, istate_t *istate)	188	void pht_refill(bool data, istate_t *istate)
189	{	189	{
190	__address badvaddr;	190	__address badvaddr;
191	pte_t *pte;	191	pte_t *pte;
192	int pfcr;	192	int pfcr;
193	as_t *as;	193	as_t *as;
194	bool lock;	194	bool lock;
195		195
196	if (AS == NULL) {	196	if (AS == NULL) {
197	as = AS_KERNEL;	197	as = AS_KERNEL;
198	lock = false;	198	lock = false;
199	} else {	199	} else {
200	as = AS;	200	as = AS;
201	lock = true;	201	lock = true;
202	}	202	}
203		203
204	if (data) {	204	if (data) {
205	asm volatile (	205	asm volatile (
206	"mfdar %0\n"	206	"mfdar %0\n"
207	: "=r" (badvaddr)	207	: "=r" (badvaddr)
208	);	208	);
209	} else	209	} else
210	badvaddr = istate->pc;	210	badvaddr = istate->pc;
211		211
212	page_table_lock(as, lock);	212	page_table_lock(as, lock);
213		213
214	pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr);	214	pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr);
215	if (!pte) {	215	if (!pte) {
216	switch (pfcr) {	216	switch (pfcr) {
217	case AS_PF_FAULT:	217	case AS_PF_FAULT:
218	goto fail;	218	goto fail;
219	break;	219	break;
220	case AS_PF_DEFER:	220	case AS_PF_DEFER:
221	/*	221	/*
222	* The page fault came during copy_from_uspace()	222	* The page fault came during copy_from_uspace()
223	* or copy_to_uspace().	223	* or copy_to_uspace().
224	*/	224	*/
225	page_table_unlock(as, lock);	225	page_table_unlock(as, lock);
226	return;	226	return;
227	default:	227	default:
228	panic("Unexpected pfrc (%d)\n", pfcr);	228	panic("Unexpected pfrc (%d)\n", pfcr);
229	}	229	}
230	}	230	}
231		231
232	pte->a = 1; /* Record access to PTE */	232	pte->a = 1; /* Record access to PTE */
233	pht_insert(badvaddr, pte->pfn);	233	pht_insert(badvaddr, pte->pfn);
234		234
235	page_table_unlock(as, lock);	235	page_table_unlock(as, lock);
236	return;	236	return;
237		237
238	fail:	238	fail:
239	page_table_unlock(as, lock);	239	page_table_unlock(as, lock);
240	pht_refill_fail(badvaddr, istate);	240	pht_refill_fail(badvaddr, istate);
241	}	241	}
242		242
243		243
244	void pht_init(void)	244	void pht_init(void)
245	{	245	{
246	memsetb((__address) phte, 1 << PHT_BITS, 0);	246	memsetb((__address) phte, 1 << PHT_BITS, 0);
247	}	247	}
248		248
249		249
250	void page_arch_init(void)	250	void page_arch_init(void)
251	{	251	{
252	if (config.cpu_active == 1) {	252	if (config.cpu_active == 1) {
253	page_mapping_operations = &pt_mapping_operations;	253	page_mapping_operations = &pt_mapping_operations;
254		254
255	__address cur;	255	__address cur;
256	int flags;	256	int flags;
257		257
258	/* Pages below 128 MB are mapped using BAT,	258	/* Frames below 128 MB are mapped using BAT,
259	map rest of the physical memory */	259	map rest of the physical memory */
260	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {	260	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
261	flags = PAGE_CACHEABLE;	261	flags = PAGE_CACHEABLE;
262	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))	262	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
263	flags \|= PAGE_GLOBAL;	263	flags \|= PAGE_GLOBAL;
264	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);	264	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
265	}	265	}
266		266
267	/* Allocate page hash table */	267	/* Allocate page hash table */
268	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));	268	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));
269	phte = (phte_t *) PA2KA((__address) physical_phte);	269	phte = (phte_t *) PA2KA((__address) physical_phte);
270		270
271	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);	271	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
272	pht_init();	272	pht_init();
273		273
274	asm volatile (	274	asm volatile (
275	"mtsdr1 %0\n"	275	"mtsdr1 %0\n"
276	:	276	:
277	: "r" ((__address) physical_phte)	277	: "r" ((__address) physical_phte)
278	);	278	);
279	}	279	}
280	}	280	}
281		281
282		282
283	__address hw_map(__address physaddr, size_t size)	283	__address hw_map(__address physaddr, size_t size)
284	{	284	{
285	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	285	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
286	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	286	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
287		287
288	__address virtaddr = PA2KA(last_frame);	288	__address virtaddr = PA2KA(last_frame);
289	pfn_t i;	289	pfn_t i;
290	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	290	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
291	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	291	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
292		292
293	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	293	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
294		294
295	return virtaddr;	295	return virtaddr;
296	}	296	}
297		297

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(root)//kernel/trunk/arch/ppc32/src/mm/page.c @ 1609 – Rev 1389 → 1390