WebSVN – HelenOS-historic – 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.
 */
 
 /** @addtogroup ppc32mm   
 * @{
 */
/** @file
 */
 
#include <arch/mm/page.h>
#include <genarch/mm/page_pt.h>
#include <arch/mm/frame.h>
#include <arch/asm.h>
#include <arch/interrupt.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 access   Access mode that caused the fault.
 * @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, int access,
                     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, access, 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(int n, 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 (n == VECTOR_DATA_STORAGE) {
        asm volatile (
            "mfdar %0\n"
            : "=r" (badvaddr)
        );
    } else
        badvaddr = istate->pc;
       
    page_table_lock(as, lock);
   
    pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, 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 1609	Rev 1702
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	/** @addtogroup ppc32mm
-		30	* @{
-		31	*/
-		32	/** @file
-		33	*/
-		34
29	#include <arch/mm/page.h>	35	#include <arch/mm/page.h>
30	#include <genarch/mm/page_pt.h>	36	#include <genarch/mm/page_pt.h>
31	#include <arch/mm/frame.h>	37	#include <arch/mm/frame.h>
32	#include <arch/asm.h>	38	#include <arch/asm.h>
33	#include <arch/interrupt.h>	39	#include <arch/interrupt.h>
34	#include <mm/frame.h>	40	#include <mm/frame.h>
35	#include <mm/page.h>	41	#include <mm/page.h>
36	#include <mm/as.h>	42	#include <mm/as.h>
37	#include <arch.h>	43	#include <arch.h>
38	#include <arch/types.h>	44	#include <arch/types.h>
39	#include <arch/exception.h>	45	#include <arch/exception.h>
40	#include <align.h>	46	#include <align.h>
41	#include <config.h>	47	#include <config.h>
42	#include <print.h>	48	#include <print.h>
43	#include <symtab.h>	49	#include <symtab.h>
44		50
45	static phte_t *phte;	51	static phte_t *phte;
46		52
47		53
48	/** Try to find PTE for faulting address	54	/** Try to find PTE for faulting address
49	*	55	*
50	* Try to find PTE for faulting address.	56	* Try to find PTE for faulting address.
51	* The as->lock must be held on entry to this function	57	* The as->lock must be held on entry to this function
52	* if lock is true.	58	* if lock is true.
53	*	59	*
54	* @param as Address space.	60	* @param as Address space.
55	* @param lock Lock/unlock the address space.	61	* @param lock Lock/unlock the address space.
56	* @param badvaddr Faulting virtual address.	62	* @param badvaddr Faulting virtual address.
57	* @param access Access mode that caused the fault.	63	* @param access Access mode that caused the fault.
58	* @param istate Pointer to interrupted state.	64	* @param istate Pointer to interrupted state.
59	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.	65	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.
60	* @return PTE on success, NULL otherwise.	66	* @return PTE on success, NULL otherwise.
61	*	67	*
62	*/	68	*/
63	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, int access,	69	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, int access,
64	istate_t istate, int pfcr)	70	istate_t istate, int pfcr)
65	{	71	{
66	/*	72	/*
67	* Check if the mapping exists in page tables.	73	* Check if the mapping exists in page tables.
68	*/	74	*/
69	pte_t *pte = page_mapping_find(as, badvaddr);	75	pte_t *pte = page_mapping_find(as, badvaddr);
70	if ((pte) && (pte->p)) {	76	if ((pte) && (pte->p)) {
71	/*	77	/*
72	* Mapping found in page tables.	78	* Mapping found in page tables.
73	* Immediately succeed.	79	* Immediately succeed.
74	*/	80	*/
75	return pte;	81	return pte;
76	} else {	82	} else {
77	int rc;	83	int rc;
78		84
79	/*	85	/*
80	* Mapping not found in page tables.	86	* Mapping not found in page tables.
81	* Resort to higher-level page fault handler.	87	* Resort to higher-level page fault handler.
82	*/	88	*/
83	page_table_unlock(as, lock);	89	page_table_unlock(as, lock);
84	switch (rc = as_page_fault(badvaddr, access, istate)) {	90	switch (rc = as_page_fault(badvaddr, access, istate)) {
85	case AS_PF_OK:	91	case AS_PF_OK:
86	/*	92	/*
87	* The higher-level page fault handler succeeded,	93	* The higher-level page fault handler succeeded,
88	* The mapping ought to be in place.	94	* The mapping ought to be in place.
89	*/	95	*/
90	page_table_lock(as, lock);	96	page_table_lock(as, lock);
91	pte = page_mapping_find(as, badvaddr);	97	pte = page_mapping_find(as, badvaddr);
92	ASSERT((pte) && (pte->p));	98	ASSERT((pte) && (pte->p));
93	return pte;	99	return pte;
94	case AS_PF_DEFER:	100	case AS_PF_DEFER:
95	page_table_lock(as, lock);	101	page_table_lock(as, lock);
96	*pfcr = rc;	102	*pfcr = rc;
97	return NULL;	103	return NULL;
98	case AS_PF_FAULT:	104	case AS_PF_FAULT:
99	page_table_lock(as, lock);	105	page_table_lock(as, lock);
100	printf("Page fault.\n");	106	printf("Page fault.\n");
101	*pfcr = rc;	107	*pfcr = rc;
102	return NULL;	108	return NULL;
103	default:	109	default:
104	panic("unexpected rc (%d)\n", rc);	110	panic("unexpected rc (%d)\n", rc);
105	}	111	}
106	}	112	}
107	}	113	}
108		114
109		115
110	static void pht_refill_fail(__address badvaddr, istate_t *istate)	116	static void pht_refill_fail(__address badvaddr, istate_t *istate)
111	{	117	{
112	char *symbol = "";	118	char *symbol = "";
113	char *sym2 = "";	119	char *sym2 = "";
114		120
115	char *s = get_symtab_entry(istate->pc);	121	char *s = get_symtab_entry(istate->pc);
116	if (s)	122	if (s)
117	symbol = s;	123	symbol = s;
118	s = get_symtab_entry(istate->lr);	124	s = get_symtab_entry(istate->lr);
119	if (s)	125	if (s)
120	sym2 = s;	126	sym2 = s;
121	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);	127	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
122	}	128	}
123		129
124		130
125	static void pht_insert(const __address vaddr, const pfn_t pfn)	131	static void pht_insert(const __address vaddr, const pfn_t pfn)
126	{	132	{
127	__u32 page = (vaddr >> 12) & 0xffff;	133	__u32 page = (vaddr >> 12) & 0xffff;
128	__u32 api = (vaddr >> 22) & 0x3f;	134	__u32 api = (vaddr >> 22) & 0x3f;
129	__u32 vsid;	135	__u32 vsid;
130		136
131	asm volatile (	137	asm volatile (
132	"mfsrin %0, %1\n"	138	"mfsrin %0, %1\n"
133	: "=r" (vsid)	139	: "=r" (vsid)
134	: "r" (vaddr)	140	: "r" (vaddr)
135	);	141	);
136		142
137	/* Primary hash (xor) */	143	/* Primary hash (xor) */
138	__u32 h = 0;	144	__u32 h = 0;
139	__u32 hash = vsid ^ page;	145	__u32 hash = vsid ^ page;
140	__u32 base = (hash & 0x3ff) << 3;	146	__u32 base = (hash & 0x3ff) << 3;
141	__u32 i;	147	__u32 i;
142	bool found = false;	148	bool found = false;
143		149
144	/* Find unused or colliding	150	/* Find unused or colliding
145	PTE in PTEG */	151	PTE in PTEG */
146	for (i = 0; i < 8; i++) {	152	for (i = 0; i < 8; i++) {
147	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {	153	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
148	found = true;	154	found = true;
149	break;	155	break;
150	}	156	}
151	}	157	}
152		158
153	if (!found) {	159	if (!found) {
154	/* Secondary hash (not) */	160	/* Secondary hash (not) */
155	__u32 base2 = (~hash & 0x3ff) << 3;	161	__u32 base2 = (~hash & 0x3ff) << 3;
156		162
157	/* Find unused or colliding	163	/* Find unused or colliding
158	PTE in PTEG */	164	PTE in PTEG */
159	for (i = 0; i < 8; i++) {	165	for (i = 0; i < 8; i++) {
160	if ((!phte[base2 + i].v) \|\| ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {	166	if ((!phte[base2 + i].v) \|\| ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
161	found = true;	167	found = true;
162	base = base2;	168	base = base2;
163	h = 1;	169	h = 1;
164	break;	170	break;
165	}	171	}
166	}	172	}
167		173
168	if (!found) {	174	if (!found) {
169	// TODO: A/C precedence groups	175	// TODO: A/C precedence groups
170	i = page % 8;	176	i = page % 8;
171	}	177	}
172	}	178	}
173		179
174	phte[base + i].v = 1;	180	phte[base + i].v = 1;
175	phte[base + i].vsid = vsid;	181	phte[base + i].vsid = vsid;
176	phte[base + i].h = h;	182	phte[base + i].h = h;
177	phte[base + i].api = api;	183	phte[base + i].api = api;
178	phte[base + i].rpn = pfn;	184	phte[base + i].rpn = pfn;
179	phte[base + i].r = 0;	185	phte[base + i].r = 0;
180	phte[base + i].c = 0;	186	phte[base + i].c = 0;
181	phte[base + i].pp = 2; // FIXME	187	phte[base + i].pp = 2; // FIXME
182	}	188	}
183		189
184		190
185	/** Process Instruction/Data Storage Interrupt	191	/** Process Instruction/Data Storage Interrupt
186	*	192	*
187	* @param data True if Data Storage Interrupt.	193	* @param data True if Data Storage Interrupt.
188	* @param istate Interrupted register context.	194	* @param istate Interrupted register context.
189	*	195	*
190	*/	196	*/
191	void pht_refill(int n, istate_t *istate)	197	void pht_refill(int n, istate_t *istate)
192	{	198	{
193	__address badvaddr;	199	__address badvaddr;
194	pte_t *pte;	200	pte_t *pte;
195	int pfcr;	201	int pfcr;
196	as_t *as;	202	as_t *as;
197	bool lock;	203	bool lock;
198		204
199	if (AS == NULL) {	205	if (AS == NULL) {
200	as = AS_KERNEL;	206	as = AS_KERNEL;
201	lock = false;	207	lock = false;
202	} else {	208	} else {
203	as = AS;	209	as = AS;
204	lock = true;	210	lock = true;
205	}	211	}
206		212
207	if (n == VECTOR_DATA_STORAGE) {	213	if (n == VECTOR_DATA_STORAGE) {
208	asm volatile (	214	asm volatile (
209	"mfdar %0\n"	215	"mfdar %0\n"
210	: "=r" (badvaddr)	216	: "=r" (badvaddr)
211	);	217	);
212	} else	218	} else
213	badvaddr = istate->pc;	219	badvaddr = istate->pc;
214		220
215	page_table_lock(as, lock);	221	page_table_lock(as, lock);
216		222
217	pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);	223	pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);
218	if (!pte) {	224	if (!pte) {
219	switch (pfcr) {	225	switch (pfcr) {
220	case AS_PF_FAULT:	226	case AS_PF_FAULT:
221	goto fail;	227	goto fail;
222	break;	228	break;
223	case AS_PF_DEFER:	229	case AS_PF_DEFER:
224	/*	230	/*
225	* The page fault came during copy_from_uspace()	231	* The page fault came during copy_from_uspace()
226	* or copy_to_uspace().	232	* or copy_to_uspace().
227	*/	233	*/
228	page_table_unlock(as, lock);	234	page_table_unlock(as, lock);
229	return;	235	return;
230	default:	236	default:
231	panic("Unexpected pfrc (%d)\n", pfcr);	237	panic("Unexpected pfrc (%d)\n", pfcr);
232	}	238	}
233	}	239	}
234		240
235	pte->a = 1; /* Record access to PTE */	241	pte->a = 1; /* Record access to PTE */
236	pht_insert(badvaddr, pte->pfn);	242	pht_insert(badvaddr, pte->pfn);
237		243
238	page_table_unlock(as, lock);	244	page_table_unlock(as, lock);
239	return;	245	return;
240		246
241	fail:	247	fail:
242	page_table_unlock(as, lock);	248	page_table_unlock(as, lock);
243	pht_refill_fail(badvaddr, istate);	249	pht_refill_fail(badvaddr, istate);
244	}	250	}
245		251
246		252
247	void pht_init(void)	253	void pht_init(void)
248	{	254	{
249	memsetb((__address) phte, 1 << PHT_BITS, 0);	255	memsetb((__address) phte, 1 << PHT_BITS, 0);
250	}	256	}
251		257
252		258
253	void page_arch_init(void)	259	void page_arch_init(void)
254	{	260	{
255	if (config.cpu_active == 1) {	261	if (config.cpu_active == 1) {
256	page_mapping_operations = &pt_mapping_operations;	262	page_mapping_operations = &pt_mapping_operations;
257		263
258	__address cur;	264	__address cur;
259	int flags;	265	int flags;
260		266
261	/* Frames below 128 MB are mapped using BAT,	267	/* Frames below 128 MB are mapped using BAT,
262	map rest of the physical memory */	268	map rest of the physical memory */
263	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {	269	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
264	flags = PAGE_CACHEABLE;	270	flags = PAGE_CACHEABLE;
265	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))	271	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
266	flags \|= PAGE_GLOBAL;	272	flags \|= PAGE_GLOBAL;
267	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);	273	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
268	}	274	}
269		275
270	/* Allocate page hash table */	276	/* Allocate page hash table */
271	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));	277	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));
272	phte = (phte_t *) PA2KA((__address) physical_phte);	278	phte = (phte_t *) PA2KA((__address) physical_phte);
273		279
274	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);	280	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
275	pht_init();	281	pht_init();
276		282
277	asm volatile (	283	asm volatile (
278	"mtsdr1 %0\n"	284	"mtsdr1 %0\n"
279	:	285	:
280	: "r" ((__address) physical_phte)	286	: "r" ((__address) physical_phte)
281	);	287	);
282	}	288	}
283	}	289	}
284		290
285		291
286	__address hw_map(__address physaddr, size_t size)	292	__address hw_map(__address physaddr, size_t size)
287	{	293	{
288	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	294	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
289	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	295	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
290		296
291	__address virtaddr = PA2KA(last_frame);	297	__address virtaddr = PA2KA(last_frame);
292	pfn_t i;	298	pfn_t i;
293	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	299	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
294	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	300	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
295		301
296	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	302	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
297		303
298	return virtaddr;	304	return virtaddr;
299	}	305	}
-		306
-		307	/** @}
-		308	*/
-		309
300		310

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(root)/kernel/trunk/arch/ppc32/src/mm/page.c – Rev 1609 → 1702