WebSVN – HelenOS – Diff – /tags/0.2.0.1/kernel/arch/ppc64/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 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(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, 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 1965	Rev 1968
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 access Access mode that caused the fault.	56	* @param access Access mode that caused the fault.
57	* @param istate Pointer to interrupted state.	57	* @param istate Pointer to interrupted state.
58	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.	58	* @param pfrc Pointer to variable where as_page_fault() return code will be stored.
59	* @return PTE on success, NULL otherwise.	59	* @return PTE on success, NULL otherwise.
60	*	60	*
61	*/	61	*/
62	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, int access,	62	static pte_t find_mapping_and_check(as_t as, bool lock, __address badvaddr, int access,
63	istate_t istate, int pfcr)	63	istate_t istate, int pfcr)
64	{	64	{
65	/*	65	/*
66	* Check if the mapping exists in page tables.	66	* Check if the mapping exists in page tables.
67	*/	67	*/
68	pte_t *pte = page_mapping_find(as, badvaddr);	68	pte_t *pte = page_mapping_find(as, badvaddr);
69	if ((pte) && (pte->p)) {	69	if ((pte) && (pte->p)) {
70	/*	70	/*
71	* Mapping found in page tables.	71	* Mapping found in page tables.
72	* Immediately succeed.	72	* Immediately succeed.
73	*/	73	*/
74	return pte;	74	return pte;
75	} else {	75	} else {
76	int rc;	76	int rc;
77		77
78	/*	78	/*
79	* Mapping not found in page tables.	79	* Mapping not found in page tables.
80	* Resort to higher-level page fault handler.	80	* Resort to higher-level page fault handler.
81	*/	81	*/
82	page_table_unlock(as, lock);	82	page_table_unlock(as, lock);
83	switch (rc = as_page_fault(badvaddr, access, istate)) {	83	switch (rc = as_page_fault(badvaddr, access, istate)) {
84	case AS_PF_OK:	84	case AS_PF_OK:
85	/*	85	/*
86	* The higher-level page fault handler succeeded,	86	* The higher-level page fault handler succeeded,
87	* The mapping ought to be in place.	87	* The mapping ought to be in place.
88	*/	88	*/
89	page_table_lock(as, lock);	89	page_table_lock(as, lock);
90	pte = page_mapping_find(as, badvaddr);	90	pte = page_mapping_find(as, badvaddr);
91	ASSERT((pte) && (pte->p));	91	ASSERT((pte) && (pte->p));
92	return pte;	92	return pte;
93	case AS_PF_DEFER:	93	case AS_PF_DEFER:
94	page_table_lock(as, lock);	94	page_table_lock(as, lock);
95	*pfcr = rc;	95	*pfcr = rc;
96	return NULL;	96	return NULL;
97	case AS_PF_FAULT:	97	case AS_PF_FAULT:
98	page_table_lock(as, lock);	98	page_table_lock(as, lock);
99	printf("Page fault.\n");	99	printf("Page fault.\n");
100	*pfcr = rc;	100	*pfcr = rc;
101	return NULL;	101	return NULL;
102	default:	102	default:
103	panic("unexpected rc (%d)\n", rc);	103	panic("unexpected rc (%d)\n", rc);
104	}	104	}
105	}	105	}
106	}	106	}
107		107
108		108
109	static void pht_refill_fail(__address badvaddr, istate_t *istate)	109	static void pht_refill_fail(__address badvaddr, istate_t *istate)
110	{	110	{
111	char *symbol = "";	111	char *symbol = "";
112	char *sym2 = "";	112	char *sym2 = "";
113		113
114	char *s = get_symtab_entry(istate->pc);	114	char *s = get_symtab_entry(istate->pc);
115	if (s)	115	if (s)
116	symbol = s;	116	symbol = s;
117	s = get_symtab_entry(istate->lr);	117	s = get_symtab_entry(istate->lr);
118	if (s)	118	if (s)
119	sym2 = s;	119	sym2 = s;
120	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);	120	panic("%p: PHT Refill Exception at %p (%s<-%s)\n", badvaddr, istate->pc, symbol, sym2);
121	}	121	}
122		122
123		123
124	static void pht_insert(const __address vaddr, const pfn_t pfn)	124	static void pht_insert(const __address vaddr, const pfn_t pfn)
125	{	125	{
126	__u32 page = (vaddr >> 12) & 0xffff;	126	__u32 page = (vaddr >> 12) & 0xffff;
127	__u32 api = (vaddr >> 22) & 0x3f;	127	__u32 api = (vaddr >> 22) & 0x3f;
128	__u32 vsid;	128	__u32 vsid;
129		129
130	asm volatile (	130	asm volatile (
131	"mfsrin %0, %1\n"	131	"mfsrin %0, %1\n"
132	: "=r" (vsid)	132	: "=r" (vsid)
133	: "r" (vaddr)	133	: "r" (vaddr)
134	);	134	);
135		135
136	/* Primary hash (xor) */	136	/* Primary hash (xor) */
137	__u32 h = 0;	137	__u32 h = 0;
138	__u32 hash = vsid ^ page;	138	__u32 hash = vsid ^ page;
139	__u32 base = (hash & 0x3ff) << 3;	139	__u32 base = (hash & 0x3ff) << 3;
140	__u32 i;	140	__u32 i;
141	bool found = false;	141	bool found = false;
142		142
143	/* Find unused or colliding	143	/* Find unused or colliding
144	PTE in PTEG */	144	PTE in PTEG */
145	for (i = 0; i < 8; i++) {	145	for (i = 0; i < 8; i++) {
146	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {	146	if ((!phte[base + i].v) \|\| ((phte[base + i].vsid == vsid) && (phte[base + i].api == api))) {
147	found = true;	147	found = true;
148	break;	148	break;
149	}	149	}
150	}	150	}
151		151
152	if (!found) {	152	if (!found) {
153	/* Secondary hash (not) */	153	/* Secondary hash (not) */
154	__u32 base2 = (~hash & 0x3ff) << 3;	154	__u32 base2 = (~hash & 0x3ff) << 3;
155		155
156	/* Find unused or colliding	156	/* Find unused or colliding
157	PTE in PTEG */	157	PTE in PTEG */
158	for (i = 0; i < 8; i++) {	158	for (i = 0; i < 8; i++) {
159	if ((!phte[base2 + i].v) \|\| ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {	159	if ((!phte[base2 + i].v) \|\| ((phte[base2 + i].vsid == vsid) && (phte[base2 + i].api == api))) {
160	found = true;	160	found = true;
161	base = base2;	161	base = base2;
162	h = 1;	162	h = 1;
163	break;	163	break;
164	}	164	}
165	}	165	}
166		166
167	if (!found) {	167	if (!found) {
168	// TODO: A/C precedence groups	168	// TODO: A/C precedence groups
169	i = page % 8;	169	i = page % 8;
170	}	170	}
171	}	171	}
172		172
173	phte[base + i].v = 1;	173	phte[base + i].v = 1;
174	phte[base + i].vsid = vsid;	174	phte[base + i].vsid = vsid;
175	phte[base + i].h = h;	175	phte[base + i].h = h;
176	phte[base + i].api = api;	176	phte[base + i].api = api;
177	phte[base + i].rpn = pfn;	177	phte[base + i].rpn = pfn;
178	phte[base + i].r = 0;	178	phte[base + i].r = 0;
179	phte[base + i].c = 0;	179	phte[base + i].c = 0;
180	phte[base + i].pp = 2; // FIXME	180	phte[base + i].pp = 2; // FIXME
181	}	181	}
182		182
183		183
184	/** Process Instruction/Data Storage Interrupt	184	/** Process Instruction/Data Storage Interrupt
185	*	185	*
186	* @param data True if Data Storage Interrupt.	186	* @param data True if Data Storage Interrupt.
187	* @param istate Interrupted register context.	187	* @param istate Interrupted register context.
188	*	188	*
189	*/	189	*/
190	void pht_refill(bool data, istate_t *istate)	190	void pht_refill(bool data, istate_t *istate)
191	{	191	{
192	__address badvaddr;	192	__address badvaddr;
193	pte_t *pte;	193	pte_t *pte;
194	int pfcr;	194	int pfcr;
195	as_t *as;	195	as_t *as;
196	bool lock;	196	bool lock;
197		197
198	if (AS == NULL) {	198	if (AS == NULL) {
199	as = AS_KERNEL;	199	as = AS_KERNEL;
200	lock = false;	200	lock = false;
201	} else {	201	} else {
202	as = AS;	202	as = AS;
203	lock = true;	203	lock = true;
204	}	204	}
205		205
206	if (data) {	206	if (data) {
207	asm volatile (	207	asm volatile (
208	"mfdar %0\n"	208	"mfdar %0\n"
209	: "=r" (badvaddr)	209	: "=r" (badvaddr)
210	);	210	);
211	} else	211	} else
212	badvaddr = istate->pc;	212	badvaddr = istate->pc;
213		213
214	page_table_lock(as, lock);	214	page_table_lock(as, lock);
215		215
216	pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);	216	pte = find_mapping_and_check(as, lock, badvaddr, PF_ACCESS_READ /* FIXME */, istate, &pfcr);
217	if (!pte) {	217	if (!pte) {
218	switch (pfcr) {	218	switch (pfcr) {
219	case AS_PF_FAULT:	219	case AS_PF_FAULT:
220	goto fail;	220	goto fail;
221	break;	221	break;
222	case AS_PF_DEFER:	222	case AS_PF_DEFER:
223	/*	223	/*
224	* The page fault came during copy_from_uspace()	224	* The page fault came during copy_from_uspace()
225	* or copy_to_uspace().	225	* or copy_to_uspace().
226	*/	226	*/
227	page_table_unlock(as, lock);	227	page_table_unlock(as, lock);
228	return;	228	return;
229	default:	229	default:
230	panic("Unexpected pfrc (%d)\n", pfcr);	230	panic("Unexpected pfrc (%d)\n", pfcr);
231	}	231	}
232	}	232	}
233		233
234	pte->a = 1; /* Record access to PTE */	234	pte->a = 1; /* Record access to PTE */
235	pht_insert(badvaddr, pte->pfn);	235	pht_insert(badvaddr, pte->pfn);
236		236
237	page_table_unlock(as, lock);	237	page_table_unlock(as, lock);
238	return;	238	return;
239		239
240	fail:	240	fail:
241	page_table_unlock(as, lock);	241	page_table_unlock(as, lock);
242	pht_refill_fail(badvaddr, istate);	242	pht_refill_fail(badvaddr, istate);
243	}	243	}
244		244
245		245
246	void pht_init(void)	246	void pht_init(void)
247	{	247	{
248	memsetb((__address) phte, 1 << PHT_BITS, 0);	248	memsetb((__address) phte, 1 << PHT_BITS, 0);
249	}	249	}
250		250
251		251
252	void page_arch_init(void)	252	void page_arch_init(void)
253	{	253	{
254	if (config.cpu_active == 1) {	254	if (config.cpu_active == 1) {
255	page_mapping_operations = &pt_mapping_operations;	255	page_mapping_operations = &pt_mapping_operations;
256		256
257	__address cur;	257	__address cur;
258	int flags;	258	int flags;
259		259
260	/* Frames below 128 MB are mapped using BAT,	260	/* Frames below 128 MB are mapped using BAT,
261	map rest of the physical memory */	261	map rest of the physical memory */
262	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {	262	for (cur = 128 << 20; cur < last_frame; cur += FRAME_SIZE) {
263	flags = PAGE_CACHEABLE;	263	flags = PAGE_CACHEABLE;
264	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))	264	if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
265	flags \|= PAGE_GLOBAL;	265	flags \|= PAGE_GLOBAL;
266	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);	266	page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
267	}	267	}
268		268
269	/* Allocate page hash table */	269	/* Allocate page hash table */
270	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));	270	phte_t physical_phte = (phte_t ) PFN2ADDR(frame_alloc(PHT_ORDER, FRAME_KA \| FRAME_PANIC));
271	phte = (phte_t *) PA2KA((__address) physical_phte);	271	phte = (phte_t *) PA2KA((__address) physical_phte);
272		272
273	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);	273	ASSERT((__address) physical_phte % (1 << PHT_BITS) == 0);
274	pht_init();	274	pht_init();
275		275
276	asm volatile (	276	asm volatile (
277	"mtsdr1 %0\n"	277	"mtsdr1 %0\n"
278	:	278	:
279	: "r" ((__address) physical_phte)	279	: "r" ((__address) physical_phte)
280	);	280	);
281	}	281	}
282	}	282	}
283		283
284		284
285	__address hw_map(__address physaddr, size_t size)	285	__address hw_map(__address physaddr, size_t size)
286	{	286	{
287	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))	287	if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
288	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)	288	panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
289		289
290	__address virtaddr = PA2KA(last_frame);	290	__address virtaddr = PA2KA(last_frame);
291	pfn_t i;	291	pfn_t i;
292	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)	292	for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
293	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);	293	page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
294		294
295	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);	295	last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
296		296
297	return virtaddr;	297	return virtaddr;
298	}	298	}
299		299

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(root)/tags/0.2.0.1/kernel/arch/ppc64/src/mm/page.c – Rev 1965 → 1968