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


/*
 * Copyright (c) 2006 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 <mm/tlb.h>
#include <arch/mm/tlb.h>
#include <arch/interrupt.h>
#include <interrupt.h>
#include <mm/as.h>
#include <arch.h>
#include <print.h>
#include <symtab.h>
#include <macros.h>
 
 
static unsigned int seed = 10;
static unsigned int seed_real __attribute__ ((section("K_UNMAPPED_DATA_START"))) = 42;
 
 
#define TLB_FLUSH \
    "tlbie %0\n" \
    "addi %0, %0, 0x1000\n"
 
 
/** 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, uintptr_t badvaddr, int access,
    istate_t *istate, int *pfrc)
{
    /*
     * Check if the mapping exists in page tables.
     */
    pte_t *pte = page_mapping_find(as, badvaddr);
    if ((pte) && (pte->present)) {
        /*
         * 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->present));
            *pfrc = 0;
            return pte;
        case AS_PF_DEFER:
            page_table_lock(as, lock);
            *pfrc = rc;
            return NULL;
        case AS_PF_FAULT:
            page_table_lock(as, lock);
            *pfrc = rc;
            return NULL;
        default:
            panic("Unexpected rc (%d).", rc);
        }  
    }
}
 
 
static void pht_refill_fail(uintptr_t badvaddr, istate_t *istate)
{
    char *symbol = "";
    char *sym2 = "";
 
    char *str = get_symtab_entry(istate->pc);
    if (str)
        symbol = str;
    str = get_symtab_entry(istate->lr);
    if (str)
        sym2 = str;
 
    fault_if_from_uspace(istate,
        "PHT Refill Exception on %p.", badvaddr);
    panic("%p: PHT Refill Exception at %p (%s<-%s).", badvaddr,
        istate->pc, symbol, sym2);
}
 
 
static void pht_insert(const uintptr_t vaddr, const pte_t *pte)
{
    uint32_t page = (vaddr >> 12) & 0xffff;
    uint32_t api = (vaddr >> 22) & 0x3f;
   
    uint32_t vsid;
    asm volatile (
        "mfsrin %0, %1\n"
        : "=r" (vsid)
        : "r" (vaddr)
    );
   
    uint32_t sdr1;
    asm volatile (
        "mfsdr1 %0\n"
        : "=r" (sdr1)
    );
    phte_t *phte = (phte_t *) PA2KA(sdr1 & 0xffff0000);
   
    /* Primary hash (xor) */
    uint32_t h = 0;
    uint32_t hash = vsid ^ page;
    uint32_t base = (hash & 0x3ff) << 3;
    uint32_t i;
    bool found = false;
   
    /* Find 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)
            && (phte[base + i].h == 0)) {
            found = true;
            break;
        }
    }
   
    if (!found) {
        /* Find unused PTE in PTEG */
        for (i = 0; i < 8; i++) {
            if (!phte[base + i].v) {
                found = true;
                break;
            }
        }
    }
   
    if (!found) {
        /* Secondary hash (not) */
        uint32_t base2 = (~hash & 0x3ff) << 3;
       
        /* Find 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)
                && (phte[base2 + i].h == 1)) {
                found = true;
                base = base2;
                h = 1;
                break;
            }
        }
       
        if (!found) {
            /* Find unused PTE in PTEG */
            for (i = 0; i < 8; i++) {
                if (!phte[base2 + i].v) {
                    found = true;
                    base = base2;
                    h = 1;
                    break;
                }
            }
        }
       
        if (!found)
            i = RANDI(seed) % 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 = pte->pfn;
    phte[base + i].r = 0;
    phte[base + i].c = 0;
    phte[base + i].wimg = (pte->page_cache_disable ? WIMG_NO_CACHE : 0);
    phte[base + i].pp = 2; // FIXME
}
 
 
/** Process Instruction/Data Storage Exception
 *
 * @param n      Exception vector number.
 * @param istate Interrupted register context.
 *
 */
void pht_refill(int n, istate_t *istate)
{
    uintptr_t badvaddr;
    pte_t *pte;
    int pfrc;
    as_t *as;
    bool lock;
   
    if (AS == NULL) {
        as = AS_KERNEL;
        lock = false;
    } else {
        as = AS;
        lock = true;
    }
   
    if (n == VECTOR_DATA_STORAGE)
        badvaddr = istate->dar;
    else
        badvaddr = istate->pc;
       
    page_table_lock(as, lock);
   
    pte = find_mapping_and_check(as, lock, badvaddr,
        PF_ACCESS_READ /* FIXME */, istate, &pfrc);
    if (!pte) {
        switch (pfrc) {
        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).", pfrc);
        }
    }
   
    pte->accessed = 1; /* Record access to PTE */
    pht_insert(badvaddr, pte);
   
    page_table_unlock(as, lock);
    return;
   
fail:
    page_table_unlock(as, lock);
    pht_refill_fail(badvaddr, istate);
}
 
 
/** Process Instruction/Data Storage Exception in Real Mode
 *
 * @param n      Exception vector number.
 * @param istate Interrupted register context.
 *
 */
bool pht_refill_real(int n, istate_t *istate)
{
    uintptr_t badvaddr;
   
    if (n == VECTOR_DATA_STORAGE)
        badvaddr = istate->dar;
    else
        badvaddr = istate->pc;
   
    uint32_t physmem;
    asm volatile (
        "mfsprg3 %0\n"
        : "=r" (physmem)
    );
   
    if ((badvaddr < PA2KA(0)) || (badvaddr >= PA2KA(physmem)))
        return false;
   
    uint32_t page = (badvaddr >> 12) & 0xffff;
    uint32_t api = (badvaddr >> 22) & 0x3f;
   
    uint32_t vsid;
    asm volatile (
        "mfsrin %0, %1\n"
        : "=r" (vsid)
        : "r" (badvaddr)
    );
   
    uint32_t sdr1;
    asm volatile (
        "mfsdr1 %0\n"
        : "=r" (sdr1)
    );
    phte_t *phte_real = (phte_t *) (sdr1 & 0xffff0000);
   
    /* Primary hash (xor) */
    uint32_t h = 0;
    uint32_t hash = vsid ^ page;
    uint32_t base = (hash & 0x3ff) << 3;
    uint32_t i;
    bool found = false;
   
    /* Find colliding PTE in PTEG */
    for (i = 0; i < 8; i++) {
        if ((phte_real[base + i].v)
            && (phte_real[base + i].vsid == vsid)
            && (phte_real[base + i].api == api)
            && (phte_real[base + i].h == 0)) {
            found = true;
            break;
        }
    }
   
    if (!found) {
        /* Find unused PTE in PTEG */
        for (i = 0; i < 8; i++) {
            if (!phte_real[base + i].v) {
                found = true;
                break;
            }
        }
    }
   
    if (!found) {
        /* Secondary hash (not) */
        uint32_t base2 = (~hash & 0x3ff) << 3;
       
        /* Find colliding PTE in PTEG */
        for (i = 0; i < 8; i++) {
            if ((phte_real[base2 + i].v)
                && (phte_real[base2 + i].vsid == vsid)
                && (phte_real[base2 + i].api == api)
                && (phte_real[base2 + i].h == 1)) {
                found = true;
                base = base2;
                h = 1;
                break;
            }
        }
       
        if (!found) {
            /* Find unused PTE in PTEG */
            for (i = 0; i < 8; i++) {
                if (!phte_real[base2 + i].v) {
                    found = true;
                    base = base2;
                    h = 1;
                    break;
                }
            }
        }
       
        if (!found) {
            /* Use secondary hash to avoid collisions
               with usual PHT refill handler. */
            i = RANDI(seed_real) % 8;
            base = base2;
            h = 1;
        }
    }
   
    phte_real[base + i].v = 1;
    phte_real[base + i].vsid = vsid;
    phte_real[base + i].h = h;
    phte_real[base + i].api = api;
    phte_real[base + i].rpn = KA2PA(badvaddr) >> 12;
    phte_real[base + i].r = 0;
    phte_real[base + i].c = 0;
    phte_real[base + i].wimg = 0;
    phte_real[base + i].pp = 2; // FIXME
   
    return true;
}
 
 
/** Process ITLB/DTLB Miss Exception in Real Mode
 *
 *
 */
void tlb_refill_real(int n, uint32_t tlbmiss, ptehi_t ptehi, ptelo_t ptelo, istate_t *istate)
{
    uint32_t badvaddr = tlbmiss & 0xfffffffc;
   
    uint32_t physmem;
    asm volatile (
        "mfsprg3 %0\n"
        : "=r" (physmem)
    );
   
    if ((badvaddr < PA2KA(0)) || (badvaddr >= PA2KA(physmem)))
        return; // FIXME
   
    ptelo.rpn = KA2PA(badvaddr) >> 12;
    ptelo.wimg = 0;
    ptelo.pp = 2; // FIXME
   
    uint32_t index = 0;
    asm volatile (
        "mtspr 981, %0\n"
        "mtspr 982, %1\n"
        "tlbld %2\n"
        "tlbli %2\n"
        : "=r" (index)
        : "r" (ptehi),
          "r" (ptelo)
    );
}
 
 
void tlb_arch_init(void)
{
    tlb_invalidate_all();
}
 
 
void tlb_invalidate_all(void)
{
    uint32_t index;
    asm volatile (
        "li %0, 0\n"
        "sync\n"
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
        TLB_FLUSH
       
        "eieio\n"
        "tlbsync\n"
        "sync\n"
        : "=r" (index)
    );
}
 
 
void tlb_invalidate_asid(asid_t asid)
{
    uint32_t sdr1;
    asm volatile (
        "mfsdr1 %0\n"
        : "=r" (sdr1)
    );
    phte_t *phte = (phte_t *) PA2KA(sdr1 & 0xffff0000);
   
    uint32_t i;
    for (i = 0; i < 8192; i++) {
        if ((phte[i].v) && (phte[i].vsid >= (asid << 4)) &&
            (phte[i].vsid < ((asid << 4) + 16)))
            phte[i].v = 0;
    }
    tlb_invalidate_all();
}
 
 
void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
{
    // TODO
    tlb_invalidate_all();
}
 
 
#define PRINT_BAT(name, ureg, lreg) \
    asm volatile ( \
        "mfspr %0," #ureg "\n" \
        "mfspr %1," #lreg "\n" \
        : "=r" (upper), "=r" (lower) \
    ); \
    mask = (upper & 0x1ffc) >> 2; \
    if (upper & 3) { \
        uint32_t tmp = mask; \
        length = 128; \
        while (tmp) { \
            if ((tmp & 1) == 0) { \
                printf("ibat[0]: error in mask\n"); \
                break; \
            } \
            length <<= 1; \
            tmp >>= 1; \
        } \
    } else \
        length = 0; \
    printf(name ": page=%.*p frame=%.*p length=%d KB (mask=%#x)%s%s\n", \
        sizeof(upper) * 2, upper & 0xffff0000, sizeof(lower) * 2, \
        lower & 0xffff0000, length, mask, \
        ((upper >> 1) & 1) ? " supervisor" : "", \
        (upper & 1) ? " user" : "");
 
 
void tlb_print(void)
{
    uint32_t sr;
   
    for (sr = 0; sr < 16; sr++) {
        uint32_t vsid;
        asm volatile (
            "mfsrin %0, %1\n"
            : "=r" (vsid)
            : "r" (sr << 28)
        );
        printf("sr[%02u]: vsid=%.*p (asid=%u)%s%s\n", sr,
            sizeof(vsid) * 2, vsid & 0xffffff, (vsid & 0xffffff) >> 4,
            ((vsid >> 30) & 1) ? " supervisor" : "",
            ((vsid >> 29) & 1) ? " user" : "");
    }
   
    uint32_t upper;
    uint32_t lower;
    uint32_t mask;
    uint32_t length;
   
    PRINT_BAT("ibat[0]", 528, 529);
    PRINT_BAT("ibat[1]", 530, 531);
    PRINT_BAT("ibat[2]", 532, 533);
    PRINT_BAT("ibat[3]", 534, 535);
   
    PRINT_BAT("dbat[0]", 536, 537);
    PRINT_BAT("dbat[1]", 538, 539);
    PRINT_BAT("dbat[2]", 540, 541);
    PRINT_BAT("dbat[3]", 542, 543);
}
 
/** @}
 */
 

Rev 3856	Rev 3857
1	/*	1	/*
2	* Copyright (c) 2006 Martin Decky	2	* Copyright (c) 2006 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	29	/** @addtogroup ppc32mm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <mm/tlb.h>	35	#include <mm/tlb.h>
36	#include <arch/mm/tlb.h>	36	#include <arch/mm/tlb.h>
37	#include <arch/interrupt.h>	37	#include <arch/interrupt.h>
38	#include <interrupt.h>	38	#include <interrupt.h>
39	#include <mm/as.h>	39	#include <mm/as.h>
40	#include <arch.h>	40	#include <arch.h>
41	#include <print.h>	41	#include <print.h>
42	#include <symtab.h>	42	#include <symtab.h>
43	#include <macros.h>	43	#include <macros.h>
44		44
45		45
46	static unsigned int seed = 10;	46	static unsigned int seed = 10;
47	static unsigned int seed_real __attribute__ ((section("K_UNMAPPED_DATA_START"))) = 42;	47	static unsigned int seed_real __attribute__ ((section("K_UNMAPPED_DATA_START"))) = 42;
48		48
49		49
50	#define TLB_FLUSH \	50	#define TLB_FLUSH \
51	"tlbie %0\n" \	51	"tlbie %0\n" \
52	"addi %0, %0, 0x1000\n"	52	"addi %0, %0, 0x1000\n"
53		53
54		54
55	/** Try to find PTE for faulting address	55	/** Try to find PTE for faulting address
56	*	56	*
57	* Try to find PTE for faulting address.	57	* Try to find PTE for faulting address.
58	* The as->lock must be held on entry to this function	58	* The as->lock must be held on entry to this function
59	* if lock is true.	59	* if lock is true.
60	*	60	*
61	* @param as Address space.	61	* @param as Address space.
62	* @param lock Lock/unlock the address space.	62	* @param lock Lock/unlock the address space.
63	* @param badvaddr Faulting virtual address.	63	* @param badvaddr Faulting virtual address.
64	* @param access Access mode that caused the fault.	64	* @param access Access mode that caused the fault.
65	* @param istate Pointer to interrupted state.	65	* @param istate Pointer to interrupted state.
66	* @param pfrc Pointer to variable where as_page_fault() return code	66	* @param pfrc Pointer to variable where as_page_fault() return code
67	* will be stored.	67	* will be stored.
68	* @return PTE on success, NULL otherwise.	68	* @return PTE on success, NULL otherwise.
69	*	69	*
70	*/	70	*/
71	static pte_t *	71	static pte_t *
72	find_mapping_and_check(as_t *as, bool lock, uintptr_t badvaddr, int access,	72	find_mapping_and_check(as_t *as, bool lock, uintptr_t badvaddr, int access,
73	istate_t istate, int pfrc)	73	istate_t istate, int pfrc)
74	{	74	{
75	/*	75	/*
76	* Check if the mapping exists in page tables.	76	* Check if the mapping exists in page tables.
77	*/	77	*/
78	pte_t *pte = page_mapping_find(as, badvaddr);	78	pte_t *pte = page_mapping_find(as, badvaddr);
79	if ((pte) && (pte->present)) {	79	if ((pte) && (pte->present)) {
80	/*	80	/*
81	* Mapping found in page tables.	81	* Mapping found in page tables.
82	* Immediately succeed.	82	* Immediately succeed.
83	*/	83	*/
84	return pte;	84	return pte;
85	} else {	85	} else {
86	int rc;	86	int rc;
87		87
88	/*	88	/*
89	* Mapping not found in page tables.	89	* Mapping not found in page tables.
90	* Resort to higher-level page fault handler.	90	* Resort to higher-level page fault handler.
91	*/	91	*/
92	page_table_unlock(as, lock);	92	page_table_unlock(as, lock);
93	switch (rc = as_page_fault(badvaddr, access, istate)) {	93	switch (rc = as_page_fault(badvaddr, access, istate)) {
94	case AS_PF_OK:	94	case AS_PF_OK:
95	/*	95	/*
96	* The higher-level page fault handler succeeded,	96	* The higher-level page fault handler succeeded,
97	* The mapping ought to be in place.	97	* The mapping ought to be in place.
98	*/	98	*/
99	page_table_lock(as, lock);	99	page_table_lock(as, lock);
100	pte = page_mapping_find(as, badvaddr);	100	pte = page_mapping_find(as, badvaddr);
101	ASSERT((pte) && (pte->present));	101	ASSERT((pte) && (pte->present));
102	*pfrc = 0;	102	*pfrc = 0;
103	return pte;	103	return pte;
104	case AS_PF_DEFER:	104	case AS_PF_DEFER:
105	page_table_lock(as, lock);	105	page_table_lock(as, lock);
106	*pfrc = rc;	106	*pfrc = rc;
107	return NULL;	107	return NULL;
108	case AS_PF_FAULT:	108	case AS_PF_FAULT:
109	page_table_lock(as, lock);	109	page_table_lock(as, lock);
110	*pfrc = rc;	110	*pfrc = rc;
111	return NULL;	111	return NULL;
112	default:	112	default:
113	panic("Unexpected rc (%d).", rc);	113	panic("Unexpected rc (%d).", rc);
114	}	114	}
115	}	115	}
116	}	116	}
117		117
118		118
119	static void pht_refill_fail(uintptr_t badvaddr, istate_t *istate)	119	static void pht_refill_fail(uintptr_t badvaddr, istate_t *istate)
120	{	120	{
121	char *symbol = "";	121	char *symbol = "";
122	char *sym2 = "";	122	char *sym2 = "";
123		123
124	char *str = get_symtab_entry(istate->pc);	124	char *str = get_symtab_entry(istate->pc);
125	if (str)	125	if (str)
126	symbol = str;	126	symbol = str;
127	str = get_symtab_entry(istate->lr);	127	str = get_symtab_entry(istate->lr);
128	if (str)	128	if (str)
129	sym2 = str;	129	sym2 = str;
130		130
131	fault_if_from_uspace(istate,	131	fault_if_from_uspace(istate,
132	"PHT Refill Exception on %p.", badvaddr);	132	"PHT Refill Exception on %p.", badvaddr);
133	panic("%p: PHT Refill Exception at %p (%s<-%s).", badvaddr,	133	panic("%p: PHT Refill Exception at %p (%s<-%s).", badvaddr,
134	istate->pc, symbol, sym2);	134	istate->pc, symbol, sym2);
135	}	135	}
136		136
137		137
138	static void pht_insert(const uintptr_t vaddr, const pte_t *pte)	138	static void pht_insert(const uintptr_t vaddr, const pte_t *pte)
139	{	139	{
140	uint32_t page = (vaddr >> 12) & 0xffff;	140	uint32_t page = (vaddr >> 12) & 0xffff;
141	uint32_t api = (vaddr >> 22) & 0x3f;	141	uint32_t api = (vaddr >> 22) & 0x3f;
142		142
143	uint32_t vsid;	143	uint32_t vsid;
144	asm volatile (	144	asm volatile (
145	"mfsrin %0, %1\n"	145	"mfsrin %0, %1\n"
146	: "=r" (vsid)	146	: "=r" (vsid)
147	: "r" (vaddr)	147	: "r" (vaddr)
148	);	148	);
149		149
150	uint32_t sdr1;	150	uint32_t sdr1;
151	asm volatile (	151	asm volatile (
152	"mfsdr1 %0\n"	152	"mfsdr1 %0\n"
153	: "=r" (sdr1)	153	: "=r" (sdr1)
154	);	154	);
155	phte_t phte = (phte_t ) PA2KA(sdr1 & 0xffff0000);	155	phte_t phte = (phte_t ) PA2KA(sdr1 & 0xffff0000);
156		156
157	/* Primary hash (xor) */	157	/* Primary hash (xor) */
158	uint32_t h = 0;	158	uint32_t h = 0;
159	uint32_t hash = vsid ^ page;	159	uint32_t hash = vsid ^ page;
160	uint32_t base = (hash & 0x3ff) << 3;	160	uint32_t base = (hash & 0x3ff) << 3;
161	uint32_t i;	161	uint32_t i;
162	bool found = false;	162	bool found = false;
163		163
164	/* Find colliding PTE in PTEG */	164	/* Find colliding PTE in PTEG */
165	for (i = 0; i < 8; i++) {	165	for (i = 0; i < 8; i++) {
166	if ((phte[base + i].v)	166	if ((phte[base + i].v)
167	&& (phte[base + i].vsid == vsid)	167	&& (phte[base + i].vsid == vsid)
168	&& (phte[base + i].api == api)	168	&& (phte[base + i].api == api)
169	&& (phte[base + i].h == 0)) {	169	&& (phte[base + i].h == 0)) {
170	found = true;	170	found = true;
171	break;	171	break;
172	}	172	}
173	}	173	}
174		174
175	if (!found) {	175	if (!found) {
176	/* Find unused PTE in PTEG */	176	/* Find unused PTE in PTEG */
177	for (i = 0; i < 8; i++) {	177	for (i = 0; i < 8; i++) {
178	if (!phte[base + i].v) {	178	if (!phte[base + i].v) {
179	found = true;	179	found = true;
180	break;	180	break;
181	}	181	}
182	}	182	}
183	}	183	}
184		184
185	if (!found) {	185	if (!found) {
186	/* Secondary hash (not) */	186	/* Secondary hash (not) */
187	uint32_t base2 = (~hash & 0x3ff) << 3;	187	uint32_t base2 = (~hash & 0x3ff) << 3;
188		188
189	/* Find colliding PTE in PTEG */	189	/* Find colliding PTE in PTEG */
190	for (i = 0; i < 8; i++) {	190	for (i = 0; i < 8; i++) {
191	if ((phte[base2 + i].v)	191	if ((phte[base2 + i].v)
192	&& (phte[base2 + i].vsid == vsid)	192	&& (phte[base2 + i].vsid == vsid)
193	&& (phte[base2 + i].api == api)	193	&& (phte[base2 + i].api == api)
194	&& (phte[base2 + i].h == 1)) {	194	&& (phte[base2 + i].h == 1)) {
195	found = true;	195	found = true;
196	base = base2;	196	base = base2;
197	h = 1;	197	h = 1;
198	break;	198	break;
199	}	199	}
200	}	200	}
201		201
202	if (!found) {	202	if (!found) {
203	/* Find unused PTE in PTEG */	203	/* Find unused PTE in PTEG */
204	for (i = 0; i < 8; i++) {	204	for (i = 0; i < 8; i++) {
205	if (!phte[base2 + i].v) {	205	if (!phte[base2 + i].v) {
206	found = true;	206	found = true;
207	base = base2;	207	base = base2;
208	h = 1;	208	h = 1;
209	break;	209	break;
210	}	210	}
211	}	211	}
212	}	212	}
213		213
214	if (!found)	214	if (!found)
215	i = RANDI(seed) % 8;	215	i = RANDI(seed) % 8;
216	}	216	}
217		217
218	phte[base + i].v = 1;	218	phte[base + i].v = 1;
219	phte[base + i].vsid = vsid;	219	phte[base + i].vsid = vsid;
220	phte[base + i].h = h;	220	phte[base + i].h = h;
221	phte[base + i].api = api;	221	phte[base + i].api = api;
222	phte[base + i].rpn = pte->pfn;	222	phte[base + i].rpn = pte->pfn;
223	phte[base + i].r = 0;	223	phte[base + i].r = 0;
224	phte[base + i].c = 0;	224	phte[base + i].c = 0;
225	phte[base + i].wimg = (pte->page_cache_disable ? WIMG_NO_CACHE : 0);	225	phte[base + i].wimg = (pte->page_cache_disable ? WIMG_NO_CACHE : 0);
226	phte[base + i].pp = 2; // FIXME	226	phte[base + i].pp = 2; // FIXME
227	}	227	}
228		228
229		229
230	/** Process Instruction/Data Storage Interrupt	230	/** Process Instruction/Data Storage Exception
231	*	231	*
232	* @param n Interrupt vector number.	232	* @param n Exception vector number.
233	* @param istate Interrupted register context.	233	* @param istate Interrupted register context.
234	*	234	*
235	*/	235	*/
236	void pht_refill(int n, istate_t *istate)	236	void pht_refill(int n, istate_t *istate)
237	{	237	{
238	uintptr_t badvaddr;	238	uintptr_t badvaddr;
239	pte_t *pte;	239	pte_t *pte;
240	int pfrc;	240	int pfrc;
241	as_t *as;	241	as_t *as;
242	bool lock;	242	bool lock;
243		243
244	if (AS == NULL) {	244	if (AS == NULL) {
245	as = AS_KERNEL;	245	as = AS_KERNEL;
246	lock = false;	246	lock = false;
247	} else {	247	} else {
248	as = AS;	248	as = AS;
249	lock = true;	249	lock = true;
250	}	250	}
251		251
252	if (n == VECTOR_DATA_STORAGE)	252	if (n == VECTOR_DATA_STORAGE)
253	badvaddr = istate->dar;	253	badvaddr = istate->dar;
254	else	254	else
255	badvaddr = istate->pc;	255	badvaddr = istate->pc;
256		256
257	page_table_lock(as, lock);	257	page_table_lock(as, lock);
258		258
259	pte = find_mapping_and_check(as, lock, badvaddr,	259	pte = find_mapping_and_check(as, lock, badvaddr,
260	PF_ACCESS_READ /* FIXME */, istate, &pfrc);	260	PF_ACCESS_READ /* FIXME */, istate, &pfrc);
261	if (!pte) {	261	if (!pte) {
262	switch (pfrc) {	262	switch (pfrc) {
263	case AS_PF_FAULT:	263	case AS_PF_FAULT:
264	goto fail;	264	goto fail;
265	break;	265	break;
266	case AS_PF_DEFER:	266	case AS_PF_DEFER:
267	/*	267	/*
268	* The page fault came during copy_from_uspace()	268	* The page fault came during copy_from_uspace()
269	* or copy_to_uspace().	269	* or copy_to_uspace().
270	*/	270	*/
271	page_table_unlock(as, lock);	271	page_table_unlock(as, lock);
272	return;	272	return;
273	default:	273	default:
274	panic("Unexpected pfrc (%d).", pfrc);	274	panic("Unexpected pfrc (%d).", pfrc);
275	}	275	}
276	}	276	}
277		277
278	pte->accessed = 1; /* Record access to PTE */	278	pte->accessed = 1; /* Record access to PTE */
279	pht_insert(badvaddr, pte);	279	pht_insert(badvaddr, pte);
280		280
281	page_table_unlock(as, lock);	281	page_table_unlock(as, lock);
282	return;	282	return;
283		283
284	fail:	284	fail:
285	page_table_unlock(as, lock);	285	page_table_unlock(as, lock);
286	pht_refill_fail(badvaddr, istate);	286	pht_refill_fail(badvaddr, istate);
287	}	287	}
288		288
289		289
290	/** Process Instruction/Data Storage Interrupt in Real Mode	290	/** Process Instruction/Data Storage Exception in Real Mode
291	*	291	*
292	* @param n Interrupt vector number.	292	* @param n Exception vector number.
293	* @param istate Interrupted register context.	293	* @param istate Interrupted register context.
294	*	294	*
295	*/	295	*/
296	bool pht_refill_real(int n, istate_t *istate)	296	bool pht_refill_real(int n, istate_t *istate)
297	{	297	{
298	uintptr_t badvaddr;	298	uintptr_t badvaddr;
299		299
300	if (n == VECTOR_DATA_STORAGE)	300	if (n == VECTOR_DATA_STORAGE)
301	badvaddr = istate->dar;	301	badvaddr = istate->dar;
302	else	302	else
303	badvaddr = istate->pc;	303	badvaddr = istate->pc;
304		304
305	uint32_t physmem;	305	uint32_t physmem;
306	asm volatile (	306	asm volatile (
307	"mfsprg3 %0\n"	307	"mfsprg3 %0\n"
308	: "=r" (physmem)	308	: "=r" (physmem)
309	);	309	);
310		310
311	if ((badvaddr < PA2KA(0)) \|\| (badvaddr >= PA2KA(physmem)))	311	if ((badvaddr < PA2KA(0)) \|\| (badvaddr >= PA2KA(physmem)))
312	return false;	312	return false;
313		313
314	uint32_t page = (badvaddr >> 12) & 0xffff;	314	uint32_t page = (badvaddr >> 12) & 0xffff;
315	uint32_t api = (badvaddr >> 22) & 0x3f;	315	uint32_t api = (badvaddr >> 22) & 0x3f;
316		316
317	uint32_t vsid;	317	uint32_t vsid;
318	asm volatile (	318	asm volatile (
319	"mfsrin %0, %1\n"	319	"mfsrin %0, %1\n"
320	: "=r" (vsid)	320	: "=r" (vsid)
321	: "r" (badvaddr)	321	: "r" (badvaddr)
322	);	322	);
323		323
324	uint32_t sdr1;	324	uint32_t sdr1;
325	asm volatile (	325	asm volatile (
326	"mfsdr1 %0\n"	326	"mfsdr1 %0\n"
327	: "=r" (sdr1)	327	: "=r" (sdr1)
328	);	328	);
329	phte_t phte_real = (phte_t ) (sdr1 & 0xffff0000);	329	phte_t phte_real = (phte_t ) (sdr1 & 0xffff0000);
330		330
331	/* Primary hash (xor) */	331	/* Primary hash (xor) */
332	uint32_t h = 0;	332	uint32_t h = 0;
333	uint32_t hash = vsid ^ page;	333	uint32_t hash = vsid ^ page;
334	uint32_t base = (hash & 0x3ff) << 3;	334	uint32_t base = (hash & 0x3ff) << 3;
335	uint32_t i;	335	uint32_t i;
336	bool found = false;	336	bool found = false;
337		337
338	/* Find colliding PTE in PTEG */	338	/* Find colliding PTE in PTEG */
339	for (i = 0; i < 8; i++) {	339	for (i = 0; i < 8; i++) {
340	if ((phte_real[base + i].v)	340	if ((phte_real[base + i].v)
341	&& (phte_real[base + i].vsid == vsid)	341	&& (phte_real[base + i].vsid == vsid)
342	&& (phte_real[base + i].api == api)	342	&& (phte_real[base + i].api == api)
343	&& (phte_real[base + i].h == 0)) {	343	&& (phte_real[base + i].h == 0)) {
344	found = true;	344	found = true;
345	break;	345	break;
346	}	346	}
347	}	347	}
348		348
349	if (!found) {	349	if (!found) {
350	/* Find unused PTE in PTEG */	350	/* Find unused PTE in PTEG */
351	for (i = 0; i < 8; i++) {	351	for (i = 0; i < 8; i++) {
352	if (!phte_real[base + i].v) {	352	if (!phte_real[base + i].v) {
353	found = true;	353	found = true;
354	break;	354	break;
355	}	355	}
356	}	356	}
357	}	357	}
358		358
359	if (!found) {	359	if (!found) {
360	/* Secondary hash (not) */	360	/* Secondary hash (not) */
361	uint32_t base2 = (~hash & 0x3ff) << 3;	361	uint32_t base2 = (~hash & 0x3ff) << 3;
362		362
363	/* Find colliding PTE in PTEG */	363	/* Find colliding PTE in PTEG */
364	for (i = 0; i < 8; i++) {	364	for (i = 0; i < 8; i++) {
365	if ((phte_real[base2 + i].v)	365	if ((phte_real[base2 + i].v)
366	&& (phte_real[base2 + i].vsid == vsid)	366	&& (phte_real[base2 + i].vsid == vsid)
367	&& (phte_real[base2 + i].api == api)	367	&& (phte_real[base2 + i].api == api)
368	&& (phte_real[base2 + i].h == 1)) {	368	&& (phte_real[base2 + i].h == 1)) {
369	found = true;	369	found = true;
370	base = base2;	370	base = base2;
371	h = 1;	371	h = 1;
372	break;	372	break;
373	}	373	}
374	}	374	}
375		375
376	if (!found) {	376	if (!found) {
377	/* Find unused PTE in PTEG */	377	/* Find unused PTE in PTEG */
378	for (i = 0; i < 8; i++) {	378	for (i = 0; i < 8; i++) {
379	if (!phte_real[base2 + i].v) {	379	if (!phte_real[base2 + i].v) {
380	found = true;	380	found = true;
381	base = base2;	381	base = base2;
382	h = 1;	382	h = 1;
383	break;	383	break;
384	}	384	}
385	}	385	}
386	}	386	}
387		387
388	if (!found) {	388	if (!found) {
389	/* Use secondary hash to avoid collisions	389	/* Use secondary hash to avoid collisions
390	with usual PHT refill handler. */	390	with usual PHT refill handler. */
391	i = RANDI(seed_real) % 8;	391	i = RANDI(seed_real) % 8;
392	base = base2;	392	base = base2;
393	h = 1;	393	h = 1;
394	}	394	}
395	}	395	}
396		396
397	phte_real[base + i].v = 1;	397	phte_real[base + i].v = 1;
398	phte_real[base + i].vsid = vsid;	398	phte_real[base + i].vsid = vsid;
399	phte_real[base + i].h = h;	399	phte_real[base + i].h = h;
400	phte_real[base + i].api = api;	400	phte_real[base + i].api = api;
401	phte_real[base + i].rpn = KA2PA(badvaddr) >> 12;	401	phte_real[base + i].rpn = KA2PA(badvaddr) >> 12;
402	phte_real[base + i].r = 0;	402	phte_real[base + i].r = 0;
403	phte_real[base + i].c = 0;	403	phte_real[base + i].c = 0;
404	phte_real[base + i].wimg = 0;	404	phte_real[base + i].wimg = 0;
405	phte_real[base + i].pp = 2; // FIXME	405	phte_real[base + i].pp = 2; // FIXME
406		406
407	return true;	407	return true;
408	}	408	}
-		409
-		410
-		411	/** Process ITLB/DTLB Miss Exception in Real Mode
-		412	*
-		413	*
-		414	*/
-		415	void tlb_refill_real(int n, uint32_t tlbmiss, ptehi_t ptehi, ptelo_t ptelo, istate_t *istate)
-		416	{
-		417	uint32_t badvaddr = tlbmiss & 0xfffffffc;
-		418
-		419	uint32_t physmem;
-		420	asm volatile (
-		421	"mfsprg3 %0\n"
-		422	: "=r" (physmem)
-		423	);
-		424
-		425	if ((badvaddr < PA2KA(0)) \|\| (badvaddr >= PA2KA(physmem)))
-		426	return; // FIXME
-		427
-		428	ptelo.rpn = KA2PA(badvaddr) >> 12;
-		429	ptelo.wimg = 0;
-		430	ptelo.pp = 2; // FIXME
-		431
-		432	uint32_t index = 0;
-		433	asm volatile (
-		434	"mtspr 981, %0\n"
-		435	"mtspr 982, %1\n"
-		436	"tlbld %2\n"
-		437	"tlbli %2\n"
-		438	: "=r" (index)
-		439	: "r" (ptehi),
-		440	"r" (ptelo)
-		441	);
-		442	}
409		443
410		444
411	void tlb_arch_init(void)	445	void tlb_arch_init(void)
412	{	446	{
413	tlb_invalidate_all();	447	tlb_invalidate_all();
414	}	448	}
415		449
416		450
417	void tlb_invalidate_all(void)	451	void tlb_invalidate_all(void)
418	{	452	{
419	uint32_t index;	453	uint32_t index;
420	asm volatile (	454	asm volatile (
421	"li %0, 0\n"	455	"li %0, 0\n"
422	"sync\n"	456	"sync\n"
423		457
424	TLB_FLUSH	458	TLB_FLUSH
425	TLB_FLUSH	459	TLB_FLUSH
426	TLB_FLUSH	460	TLB_FLUSH
427	TLB_FLUSH	461	TLB_FLUSH
428	TLB_FLUSH	462	TLB_FLUSH
429	TLB_FLUSH	463	TLB_FLUSH
430	TLB_FLUSH	464	TLB_FLUSH
431	TLB_FLUSH	465	TLB_FLUSH
432		466
433	TLB_FLUSH	467	TLB_FLUSH
434	TLB_FLUSH	468	TLB_FLUSH
435	TLB_FLUSH	469	TLB_FLUSH
436	TLB_FLUSH	470	TLB_FLUSH
437	TLB_FLUSH	471	TLB_FLUSH
438	TLB_FLUSH	472	TLB_FLUSH
439	TLB_FLUSH	473	TLB_FLUSH
440	TLB_FLUSH	474	TLB_FLUSH
441		475
442	TLB_FLUSH	476	TLB_FLUSH
443	TLB_FLUSH	477	TLB_FLUSH
444	TLB_FLUSH	478	TLB_FLUSH
445	TLB_FLUSH	479	TLB_FLUSH
446	TLB_FLUSH	480	TLB_FLUSH
447	TLB_FLUSH	481	TLB_FLUSH
448	TLB_FLUSH	482	TLB_FLUSH
449	TLB_FLUSH	483	TLB_FLUSH
450		484
451	TLB_FLUSH	485	TLB_FLUSH
452	TLB_FLUSH	486	TLB_FLUSH
453	TLB_FLUSH	487	TLB_FLUSH
454	TLB_FLUSH	488	TLB_FLUSH
455	TLB_FLUSH	489	TLB_FLUSH
456	TLB_FLUSH	490	TLB_FLUSH
457	TLB_FLUSH	491	TLB_FLUSH
458	TLB_FLUSH	492	TLB_FLUSH
459		493
460	TLB_FLUSH	494	TLB_FLUSH
461	TLB_FLUSH	495	TLB_FLUSH
462	TLB_FLUSH	496	TLB_FLUSH
463	TLB_FLUSH	497	TLB_FLUSH
464	TLB_FLUSH	498	TLB_FLUSH
465	TLB_FLUSH	499	TLB_FLUSH
466	TLB_FLUSH	500	TLB_FLUSH

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ppc32/src/mm/tlb.c – Rev 3856 → 3857