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 hash = ((vsid ^ page) & 0x3ff) << 3;
   
    __u32 i;
    bool found = false;
    /* Find unused PTE in PTEG */
    for (i = 0; i < 8; i++) {
        if (!phte[hash + i].v) {
            found = true;
            break;
        }
    }
   
    if (!found) {
        /* Secondary hash (not) */
        hash = ~hash;
       
        /* Find unused PTE in PTEG */
        for (i = 0; i < 8; i++) {
            if (!phte[hash + i].v) {
                found = true;
                break;
            }
        }
       
        if (!found) {
            // TODO: A/C precedence groups
            i = page % 8;
        }
    }
   
    phte[hash + i].v = 1;
    phte[hash + i].vsid = vsid;
    phte[hash + i].h = 0;
    phte[hash + i].api = api;
    phte[hash + i].rpn = pfn;
    phte[hash + i].r = 0;
    phte[hash + i].c = 0;
    phte[hash + 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;
       
        /* 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 1383	Rev 1384
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 hash = ((vsid ^ page) & 0x3ff) << 3;	135	__u32 hash = ((vsid ^ page) & 0x3ff) << 3;
136		136
137	__u32 i;	137	__u32 i;
138	bool found = false;	138	bool found = false;
139	/* Find unused PTE in PTEG */	139	/* Find unused PTE in PTEG */
140	for (i = 0; i < 8; i++) {	140	for (i = 0; i < 8; i++) {
141	if (!phte[hash + i].v) {	141	if (!phte[hash + i].v) {
142	found = true;	142	found = true;
143	break;	143	break;
144	}	144	}
145	}	145	}
146		146
147	if (!found) {	147	if (!found) {
148	/* Secondary hash (not) */	148	/* Secondary hash (not) */
149	hash = ~hash;	149	hash = ~hash;
150		150
151	/* Find unused PTE in PTEG */	151	/* Find unused PTE in PTEG */
152	for (i = 0; i < 8; i++) {	152	for (i = 0; i < 8; i++) {
153	if (!phte[hash + i].v) {	153	if (!phte[hash + i].v) {
154	found = true;	154	found = true;
155	break;	155	break;
156	}	156	}
157	}	157	}
158		158
159	if (!found) {	159	if (!found) {
160	// TODO: A/C precedence groups	160	// TODO: A/C precedence groups
161	i = page % 8;	161	i = page % 8;
162	}	162	}
163	}	163	}
164		164
165	phte[hash + i].v = 1;	165	phte[hash + i].v = 1;
166	phte[hash + i].vsid = vsid;	166	phte[hash + i].vsid = vsid;
167	phte[hash + i].h = 0;	167	phte[hash + i].h = 0;
168	phte[hash + i].api = api;	168	phte[hash + i].api = api;
169	phte[hash + i].rpn = pfn;	169	phte[hash + i].rpn = pfn;
170	phte[hash + i].r = 0;	170	phte[hash + i].r = 0;
171	phte[hash + i].c = 0;	171	phte[hash + i].c = 0;
172	phte[hash + i].pp = 2; // FIXME	172	phte[hash + i].pp = 2; // FIXME
173	}	173	}
174		174
175		175
176	/** Process Instruction/Data Storage Interrupt	176	/** Process Instruction/Data Storage Interrupt
177	*	177	*
178	* @param data True if Data Storage Interrupt.	178	* @param data True if Data Storage Interrupt.
179	* @param istate Interrupted register context.	179	* @param istate Interrupted register context.
180	*	180	*
181	*/	181	*/
182	void pht_refill(bool data, istate_t *istate)	182	void pht_refill(bool data, istate_t *istate)
183	{	183	{
184	asid_t asid;	-
185	__address badvaddr;	184	__address badvaddr;
186	pte_t *pte;	185	pte_t *pte;
187	int pfcr;	186	int pfcr;
188	as_t *as;	187	as_t *as;
189	bool lock;	188	bool lock;
190		189
191	if (AS == NULL) {	190	if (AS == NULL) {
192	as = AS_KERNEL;	191	as = AS_KERNEL;
193	lock = false;	192	lock = false;
194	} else {	193	} else {
195	as = AS;	194	as = AS;
196	lock = true;	195	lock = true;
197	}	196	}
198		197
199	if (data) {	198	if (data) {
200	asm volatile (	199	asm volatile (
201	"mfdar %0\n"	200	"mfdar %0\n"
202	: "=r" (badvaddr)	201	: "=r" (badvaddr)
203	);	202	);
204	} else	203	} else
205	badvaddr = istate->pc;	204	badvaddr = istate->pc;
206		205
207	spinlock_lock(&as->lock);	-
208	asid = as->asid;	-
209	spinlock_unlock(&as->lock);	-
210		-
211	page_table_lock(as, lock);	206	page_table_lock(as, lock);
212		207
213	pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr);	208	pte = find_mapping_and_check(as, lock, badvaddr, istate, &pfcr);
214	if (!pte) {	209	if (!pte) {
215	switch (pfcr) {	210	switch (pfcr) {
216	case AS_PF_FAULT:	211	case AS_PF_FAULT:
217	goto fail;	212	goto fail;
218	break;	213	break;
219	case AS_PF_DEFER:	214	case AS_PF_DEFER:
220	/*	215	/*
221	* The page fault came during copy_from_uspace()	216	* The page fault came during copy_from_uspace()
222	* or copy_to_uspace().	217	* or copy_to_uspace().
223	*/	218	*/
224	page_table_unlock(as, lock);	219	page_table_unlock(as, lock);
225	return;	220	return;
226	default:	221	default:
227	panic("Unexpected pfrc (%d)\n", pfcr);	222	panic("Unexpected pfrc (%d)\n", pfcr);
228	}	223	}
229	}	224	}
230		225
231	pte->a = 1; /* Record access to PTE */	226	pte->a = 1; /* Record access to PTE */
232	pht_insert(badvaddr, pte->pfn);	227	pht_insert(badvaddr, pte->pfn);
233		228
234	page_table_unlock(as, lock);	229	page_table_unlock(as, lock);
235	return;	230	return;
236		231
237	fail:	232	fail:
238	page_table_unlock(as, lock);	233	page_table_unlock(as, lock);
239	pht_refill_fail(badvaddr, istate);	234	pht_refill_fail(badvaddr, istate);
240	}	235	}
241		236
242		237
243	void pht_init(void)	238	void pht_init(void)
244	{	239	{
245	memsetb((__address) phte, 1 << PHT_BITS, 0);	240	memsetb((__address) phte, 1 << PHT_BITS, 0);
246	}	241	}
247		242
248		243
249	void page_arch_init(void)	244	void page_arch_init(void)
250	{	245	{
251	if (config.cpu_active == 1) {	246	if (config.cpu_active == 1) {
252	page_mapping_operations = &pt_mapping_operations;	247	page_mapping_operations = &pt_mapping_operations;
253		248
254	/* Allocate page hash table */	249	/* Allocate page hash table */
255	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));	250	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));
256	phte = (phte_t *) PA2KA((__address) physical_phte);	251	phte = (phte_t *) PA2KA((__address) physical_phte);
257		252
258	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);	253	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
259	pht_init();	254	pht_init();
260		255
261	asm volatile (	256	asm volatile (
262	"mtsdr1 %0\n"	257	"mtsdr1 %0\n"
263	:	258	:
264	: "r" ((__address) physical_phte)	259	: "r" ((__address) physical_phte)
265	);	260	);
266	}	261	}
267	}	262	}
268		263
269		264
270	__address hw_map(__address physaddr, size_t size)	265	__address hw_map(__address physaddr, size_t size)
271	{	266	{
272	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	267	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
273	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	268	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
274		269
275	__address virtaddr = PA2KA(last_frame);	270	__address virtaddr = PA2KA(last_frame);
276	pfn_t i;	271	pfn_t i;
277	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	272	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
278	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	273	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
279		274
280	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	275	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
281		276
282	return virtaddr;	277	return virtaddr;
283	}	278	}
284		279

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(root)/kernel/trunk/arch/ppc32/src/mm/page.c @ 1384 – Rev 1383 → 1384