WebSVN – HelenOS – Diff – /branches/dynload/kernel/arch/sparc64/src/mm/tlb.c


/*
 * Copyright (C) 2005 Jakub Jermar
 * 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 sparc64mm  
 * @{
 */
/** @file
 */
 
#include <arch/mm/tlb.h>
#include <mm/tlb.h>
#include <mm/as.h>
#include <mm/asid.h>
#include <arch/mm/frame.h>
#include <arch/mm/page.h>
#include <arch/mm/mmu.h>
#include <arch/interrupt.h>
#include <arch.h>
#include <print.h>
#include <arch/types.h>
#include <typedefs.h>
#include <config.h>
#include <arch/trap/trap.h>
#include <panic.h>
#include <arch/asm.h>
#include <symtab.h>
 
static void dtlb_pte_copy(pte_t *t, bool ro);
static void itlb_pte_copy(pte_t *t);
static void do_fast_data_access_mmu_miss_fault(istate_t *istate, const char *str);
static void do_fast_instruction_access_mmu_miss_fault(istate_t *istate, const char *str);
static void do_fast_data_access_protection_fault(istate_t *istate, const char *str);
 
char *context_encoding[] = {
    "Primary",
    "Secondary",
    "Nucleus",
    "Reserved"
};
 
void tlb_arch_init(void)
{
    /*
     * TLBs are actually initialized early
     * in start.S.
     */
}
 
/** Insert privileged mapping into DMMU TLB.
 *
 * @param page Virtual page address.
 * @param frame Physical frame address.
 * @param pagesize Page size.
 * @param locked True for permanent mappings, false otherwise.
 * @param cacheable True if the mapping is cacheable, false otherwise.
 */
void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize, bool locked, bool cacheable)
{
    tlb_tag_access_reg_t tag;
    tlb_data_t data;
    page_address_t pg;
    frame_address_t fr;
 
    pg.address = page;
    fr.address = frame;
 
    tag.value = ASID_KERNEL;
    tag.vpn = pg.vpn;
 
    dtlb_tag_access_write(tag.value);
 
    data.value = 0;
    data.v = true;
    data.size = pagesize;
    data.pfn = fr.pfn;
    data.l = locked;
    data.cp = cacheable;
    data.cv = cacheable;
    data.p = true;
    data.w = true;
    data.g = true;
 
    dtlb_data_in_write(data.value);
}
 
/** Copy PTE to TLB.
 *
 * @param t Page Table Entry to be copied.
 * @param ro If true, the entry will be created read-only, regardless of its w field.
 */
void dtlb_pte_copy(pte_t *t, bool ro)
{
    tlb_tag_access_reg_t tag;
    tlb_data_t data;
    page_address_t pg;
    frame_address_t fr;
 
    pg.address = t->page;
    fr.address = t->frame;
 
    tag.value = 0;
    tag.context = t->as->asid;
    tag.vpn = pg.vpn;
   
    dtlb_tag_access_write(tag.value);
   
    data.value = 0;
    data.v = true;
    data.size = PAGESIZE_8K;
    data.pfn = fr.pfn;
    data.l = false;
    data.cp = t->c;
    data.cv = t->c;
    data.p = t->k;      /* p like privileged */
    data.w = ro ? false : t->w;
    data.g = t->g;
   
    dtlb_data_in_write(data.value);
}
 
void itlb_pte_copy(pte_t *t)
{
    tlb_tag_access_reg_t tag;
    tlb_data_t data;
    page_address_t pg;
    frame_address_t fr;
 
    pg.address = t->page;
    fr.address = t->frame;
 
    tag.value = 0;
    tag.context = t->as->asid;
    tag.vpn = pg.vpn;
   
    itlb_tag_access_write(tag.value);
   
    data.value = 0;
    data.v = true;
    data.size = PAGESIZE_8K;
    data.pfn = fr.pfn;
    data.l = false;
    data.cp = t->c;
    data.cv = t->c;
    data.p = t->k;      /* p like privileged */
    data.w = false;
    data.g = t->g;
   
    itlb_data_in_write(data.value);
}
 
/** ITLB miss handler. */
void fast_instruction_access_mmu_miss(int n, istate_t *istate)
{
    uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);
    pte_t *t;
 
    page_table_lock(AS, true);
    t = page_mapping_find(AS, va);
    if (t && PTE_EXECUTABLE(t)) {
        /*
         * The mapping was found in the software page hash table.
         * Insert it into ITLB.
         */
        t->a = true;
        itlb_pte_copy(t);
        page_table_unlock(AS, true);
    } else {
        /*
         * Forward the page fault to the address space page fault handler.
         */    
        page_table_unlock(AS, true);
        if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {
            do_fast_instruction_access_mmu_miss_fault(istate, __FUNCTION__);
        }
    }
}
 
/** DTLB miss handler.
 *
 * Note that some faults (e.g. kernel faults) were already resolved
 * by the low-level, assembly language part of the fast_data_access_mmu_miss
 * handler.
 */
void fast_data_access_mmu_miss(int n, istate_t *istate)
{
    tlb_tag_access_reg_t tag;
    uintptr_t va;
    pte_t *t;
 
    tag.value = dtlb_tag_access_read();
    va = tag.vpn * PAGE_SIZE;
    if (tag.context == ASID_KERNEL) {
        if (!tag.vpn) {
            /* NULL access in kernel */
            do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
        }
        do_fast_data_access_mmu_miss_fault(istate, "Unexpected kernel page fault.");
    }
 
    page_table_lock(AS, true);
    t = page_mapping_find(AS, va);
    if (t) {
        /*
         * The mapping was found in the software page hash table.
         * Insert it into DTLB.
         */
        t->a = true;
        dtlb_pte_copy(t, true);
        page_table_unlock(AS, true);
    } else {
        /*
         * Forward the page fault to the address space page fault handler.
         */    
        page_table_unlock(AS, true);
        if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
            do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
        }
    }
}
 
/** DTLB protection fault handler. */
void fast_data_access_protection(int n, istate_t *istate)
{
    tlb_tag_access_reg_t tag;
    uintptr_t va;
    pte_t *t;
 
    tag.value = dtlb_tag_access_read();
    va = tag.vpn * PAGE_SIZE;
 
    page_table_lock(AS, true);
    t = page_mapping_find(AS, va);
    if (t && PTE_WRITABLE(t)) {
        /*
         * The mapping was found in the software page hash table and is writable.
         * Demap the old mapping and insert an updated mapping into DTLB.
         */
        t->a = true;
        t->d = true;
        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, va);
        dtlb_pte_copy(t, false);
        page_table_unlock(AS, true);
    } else {
        /*
         * Forward the page fault to the address space page fault handler.
         */    
        page_table_unlock(AS, true);
        if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {
            do_fast_data_access_protection_fault(istate, __FUNCTION__);
        }
    }
}
 
/** Print contents of both TLBs. */
void tlb_print(void)
{
    int i;
    tlb_data_t d;
    tlb_tag_read_reg_t t;
   
    printf("I-TLB contents:\n");
    for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
        d.value = itlb_data_access_read(i);
        t.value = itlb_tag_read_read(i);
       
        printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
            i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
    }
 
    printf("D-TLB contents:\n");
    for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
        d.value = dtlb_data_access_read(i);
        t.value = dtlb_tag_read_read(i);
       
        printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
            i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
    }
 
}
 
void do_fast_instruction_access_mmu_miss_fault(istate_t *istate, const char *str)
{
    char *tpc_str = get_symtab_entry(istate->tpc);
 
    printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
    panic("%s\n", str);
}
 
void do_fast_data_access_mmu_miss_fault(istate_t *istate, const char *str)
{
    tlb_tag_access_reg_t tag;
    uintptr_t va;
    char *tpc_str = get_symtab_entry(istate->tpc);
 
    tag.value = dtlb_tag_access_read();
    va = tag.vpn * PAGE_SIZE;
 
    printf("Faulting page: %p, ASID=%d\n", va, tag.context);
    printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
    panic("%s\n", str);
}
 
void do_fast_data_access_protection_fault(istate_t *istate, const char *str)
{
    tlb_tag_access_reg_t tag;
    uintptr_t va;
    char *tpc_str = get_symtab_entry(istate->tpc);
 
    tag.value = dtlb_tag_access_read();
    va = tag.vpn * PAGE_SIZE;
 
    printf("Faulting page: %p, ASID=%d\n", va, tag.context);
    printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
    panic("%s\n", str);
}
 
/** Invalidate all unlocked ITLB and DTLB entries. */
void tlb_invalidate_all(void)
{
    int i;
    tlb_data_t d;
    tlb_tag_read_reg_t t;
 
    for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
        d.value = itlb_data_access_read(i);
        if (!d.l) {
            t.value = itlb_tag_read_read(i);
            d.v = false;
            itlb_tag_access_write(t.value);
            itlb_data_access_write(i, d.value);
        }
    }
   
    for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
        d.value = dtlb_data_access_read(i);
        if (!d.l) {
            t.value = dtlb_tag_read_read(i);
            d.v = false;
            dtlb_tag_access_write(t.value);
            dtlb_data_access_write(i, d.value);
        }
    }
   
}
 
/** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).
 *
 * @param asid Address Space ID.
 */
void tlb_invalidate_asid(asid_t asid)
{
    tlb_context_reg_t sc_save, ctx;
   
    ctx.v = sc_save.v = mmu_secondary_context_read();
    ctx.context = asid;
    mmu_secondary_context_write(ctx.v);
   
    itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);
    dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);
   
    mmu_secondary_context_write(sc_save.v);
}
 
/** Invalidate all ITLB and DTLB entries for specified page range in specified address space.
 *
 * @param asid Address Space ID.
 * @param page First page which to sweep out from ITLB and DTLB.
 * @param cnt Number of ITLB and DTLB entries to invalidate.
 */
void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
{
    int i;
    tlb_context_reg_t sc_save, ctx;
   
    ctx.v = sc_save.v = mmu_secondary_context_read();
    ctx.context = asid;
    mmu_secondary_context_write(ctx.v);
   
    for (i = 0; i < cnt; i++) {
        itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);
        dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);
    }
   
    mmu_secondary_context_write(sc_save.v);
}
 
/** @}
 */
 

Rev 1860	Rev 1864
1	/*	1	/*
2	* Copyright (C) 2005 Jakub Jermar	2	* Copyright (C) 2005 Jakub Jermar
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 sparc64mm	29	/** @addtogroup sparc64mm
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#include <arch/mm/tlb.h>	35	#include <arch/mm/tlb.h>
36	#include <mm/tlb.h>	36	#include <mm/tlb.h>
37	#include <mm/as.h>	37	#include <mm/as.h>
38	#include <mm/asid.h>	38	#include <mm/asid.h>
39	#include <arch/mm/frame.h>	39	#include <arch/mm/frame.h>
40	#include <arch/mm/page.h>	40	#include <arch/mm/page.h>
41	#include <arch/mm/mmu.h>	41	#include <arch/mm/mmu.h>
42	#include <arch/interrupt.h>	42	#include <arch/interrupt.h>
43	#include <arch.h>	43	#include <arch.h>
44	#include <print.h>	44	#include <print.h>
45	#include <arch/types.h>	45	#include <arch/types.h>
46	#include <typedefs.h>	46	#include <typedefs.h>
47	#include <config.h>	47	#include <config.h>
48	#include <arch/trap/trap.h>	48	#include <arch/trap/trap.h>
49	#include <panic.h>	49	#include <panic.h>
50	#include <arch/asm.h>	50	#include <arch/asm.h>
51	#include <symtab.h>	51	#include <symtab.h>
52		52
53	static void dtlb_pte_copy(pte_t *t, bool ro);	53	static void dtlb_pte_copy(pte_t *t, bool ro);
54	static void itlb_pte_copy(pte_t *t);	54	static void itlb_pte_copy(pte_t *t);
55	static void do_fast_data_access_mmu_miss_fault(istate_t istate, const char str);	55	static void do_fast_data_access_mmu_miss_fault(istate_t istate, const char str);
56	static void do_fast_instruction_access_mmu_miss_fault(istate_t istate, const char str);	56	static void do_fast_instruction_access_mmu_miss_fault(istate_t istate, const char str);
57	static void do_fast_data_access_protection_fault(istate_t istate, const char str);	57	static void do_fast_data_access_protection_fault(istate_t istate, const char str);
58		58
59	char *context_encoding[] = {	59	char *context_encoding[] = {
60	"Primary",	60	"Primary",
61	"Secondary",	61	"Secondary",
62	"Nucleus",	62	"Nucleus",
63	"Reserved"	63	"Reserved"
64	};	64	};
65		65
66	void tlb_arch_init(void)	66	void tlb_arch_init(void)
67	{	67	{
68	/*	68	/*
69	* TLBs are actually initialized early	69	* TLBs are actually initialized early
70	* in start.S.	70	* in start.S.
71	*/	71	*/
72	}	72	}
73		73
74	/** Insert privileged mapping into DMMU TLB.	74	/** Insert privileged mapping into DMMU TLB.
75	*	75	*
76	* @param page Virtual page address.	76	* @param page Virtual page address.
77	* @param frame Physical frame address.	77	* @param frame Physical frame address.
78	* @param pagesize Page size.	78	* @param pagesize Page size.
79	* @param locked True for permanent mappings, false otherwise.	79	* @param locked True for permanent mappings, false otherwise.
80	* @param cacheable True if the mapping is cacheable, false otherwise.	80	* @param cacheable True if the mapping is cacheable, false otherwise.
81	*/	81	*/
82	void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize, bool locked, bool cacheable)	82	void dtlb_insert_mapping(uintptr_t page, uintptr_t frame, int pagesize, bool locked, bool cacheable)
83	{	83	{
84	tlb_tag_access_reg_t tag;	84	tlb_tag_access_reg_t tag;
85	tlb_data_t data;	85	tlb_data_t data;
86	page_address_t pg;	86	page_address_t pg;
87	frame_address_t fr;	87	frame_address_t fr;
88		88
89	pg.address = page;	89	pg.address = page;
90	fr.address = frame;	90	fr.address = frame;
91		91
92	tag.value = ASID_KERNEL;	92	tag.value = ASID_KERNEL;
93	tag.vpn = pg.vpn;	93	tag.vpn = pg.vpn;
94		94
95	dtlb_tag_access_write(tag.value);	95	dtlb_tag_access_write(tag.value);
96		96
97	data.value = 0;	97	data.value = 0;
98	data.v = true;	98	data.v = true;
99	data.size = pagesize;	99	data.size = pagesize;
100	data.pfn = fr.pfn;	100	data.pfn = fr.pfn;
101	data.l = locked;	101	data.l = locked;
102	data.cp = cacheable;	102	data.cp = cacheable;
103	data.cv = cacheable;	103	data.cv = cacheable;
104	data.p = true;	104	data.p = true;
105	data.w = true;	105	data.w = true;
106	data.g = true;	106	data.g = true;
107		107
108	dtlb_data_in_write(data.value);	108	dtlb_data_in_write(data.value);
109	}	109	}
110		110
111	/** Copy PTE to TLB.	111	/** Copy PTE to TLB.
112	*	112	*
113	* @param t Page Table Entry to be copied.	113	* @param t Page Table Entry to be copied.
114	* @param ro If true, the entry will be created read-only, regardless of its w field.	114	* @param ro If true, the entry will be created read-only, regardless of its w field.
115	*/	115	*/
116	void dtlb_pte_copy(pte_t *t, bool ro)	116	void dtlb_pte_copy(pte_t *t, bool ro)
117	{	117	{
118	tlb_tag_access_reg_t tag;	118	tlb_tag_access_reg_t tag;
119	tlb_data_t data;	119	tlb_data_t data;
120	page_address_t pg;	120	page_address_t pg;
121	frame_address_t fr;	121	frame_address_t fr;
122		122
123	pg.address = t->page;	123	pg.address = t->page;
124	fr.address = t->frame;	124	fr.address = t->frame;
125		125
126	tag.value = 0;	126	tag.value = 0;
127	tag.context = t->as->asid;	127	tag.context = t->as->asid;
128	tag.vpn = pg.vpn;	128	tag.vpn = pg.vpn;
129		129
130	dtlb_tag_access_write(tag.value);	130	dtlb_tag_access_write(tag.value);
131		131
132	data.value = 0;	132	data.value = 0;
133	data.v = true;	133	data.v = true;
134	data.size = PAGESIZE_8K;	134	data.size = PAGESIZE_8K;
135	data.pfn = fr.pfn;	135	data.pfn = fr.pfn;
136	data.l = false;	136	data.l = false;
137	data.cp = t->c;	137	data.cp = t->c;
138	data.cv = t->c;	138	data.cv = t->c;
139	data.p = t->p;	139	data.p = t->k; /* p like privileged */
140	data.w = ro ? false : t->w;	140	data.w = ro ? false : t->w;
141	data.g = t->g;	141	data.g = t->g;
142		142
143	dtlb_data_in_write(data.value);	143	dtlb_data_in_write(data.value);
144	}	144	}
145		145
146	void itlb_pte_copy(pte_t *t)	146	void itlb_pte_copy(pte_t *t)
147	{	147	{
148	tlb_tag_access_reg_t tag;	148	tlb_tag_access_reg_t tag;
149	tlb_data_t data;	149	tlb_data_t data;
150	page_address_t pg;	150	page_address_t pg;
151	frame_address_t fr;	151	frame_address_t fr;
152		152
153	pg.address = t->page;	153	pg.address = t->page;
154	fr.address = t->frame;	154	fr.address = t->frame;
155		155
156	tag.value = 0;	156	tag.value = 0;
157	tag.context = t->as->asid;	157	tag.context = t->as->asid;
158	tag.vpn = pg.vpn;	158	tag.vpn = pg.vpn;
159		159
160	itlb_tag_access_write(tag.value);	160	itlb_tag_access_write(tag.value);
161		161
162	data.value = 0;	162	data.value = 0;
163	data.v = true;	163	data.v = true;
164	data.size = PAGESIZE_8K;	164	data.size = PAGESIZE_8K;
165	data.pfn = fr.pfn;	165	data.pfn = fr.pfn;
166	data.l = false;	166	data.l = false;
167	data.cp = t->c;	167	data.cp = t->c;
168	data.cv = t->c;	168	data.cv = t->c;
169	data.p = t->p;	169	data.p = t->k; /* p like privileged */
170	data.w = false;	170	data.w = false;
171	data.g = t->g;	171	data.g = t->g;
172		172
173	itlb_data_in_write(data.value);	173	itlb_data_in_write(data.value);
174	}	174	}
175		175
176	/** ITLB miss handler. */	176	/** ITLB miss handler. */
177	void fast_instruction_access_mmu_miss(int n, istate_t *istate)	177	void fast_instruction_access_mmu_miss(int n, istate_t *istate)
178	{	178	{
179	uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);	179	uintptr_t va = ALIGN_DOWN(istate->tpc, PAGE_SIZE);
180	pte_t *t;	180	pte_t *t;
181		181
182	page_table_lock(AS, true);	182	page_table_lock(AS, true);
183	t = page_mapping_find(AS, va);	183	t = page_mapping_find(AS, va);
184	if (t && PTE_EXECUTABLE(t)) {	184	if (t && PTE_EXECUTABLE(t)) {
185	/*	185	/*
186	* The mapping was found in the software page hash table.	186	* The mapping was found in the software page hash table.
187	* Insert it into ITLB.	187	* Insert it into ITLB.
188	*/	188	*/
189	t->a = true;	189	t->a = true;
190	itlb_pte_copy(t);	190	itlb_pte_copy(t);
191	page_table_unlock(AS, true);	191	page_table_unlock(AS, true);
192	} else {	192	} else {
193	/*	193	/*
194	* Forward the page fault to the address space page fault handler.	194	* Forward the page fault to the address space page fault handler.
195	*/	195	*/
196	page_table_unlock(AS, true);	196	page_table_unlock(AS, true);
197	if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {	197	if (as_page_fault(va, PF_ACCESS_EXEC, istate) == AS_PF_FAULT) {
198	do_fast_instruction_access_mmu_miss_fault(istate, __FUNCTION__);	198	do_fast_instruction_access_mmu_miss_fault(istate, __FUNCTION__);
199	}	199	}
200	}	200	}
201	}	201	}
202		202
203	/** DTLB miss handler.	203	/** DTLB miss handler.
204	*	204	*
205	* Note that some faults (e.g. kernel faults) were already resolved	205	* Note that some faults (e.g. kernel faults) were already resolved
206	* by the low-level, assembly language part of the fast_data_access_mmu_miss	206	* by the low-level, assembly language part of the fast_data_access_mmu_miss
207	* handler.	207	* handler.
208	*/	208	*/
209	void fast_data_access_mmu_miss(int n, istate_t *istate)	209	void fast_data_access_mmu_miss(int n, istate_t *istate)
210	{	210	{
211	tlb_tag_access_reg_t tag;	211	tlb_tag_access_reg_t tag;
212	uintptr_t va;	212	uintptr_t va;
213	pte_t *t;	213	pte_t *t;
214		214
215	tag.value = dtlb_tag_access_read();	215	tag.value = dtlb_tag_access_read();
216	va = tag.vpn * PAGE_SIZE;	216	va = tag.vpn * PAGE_SIZE;
217	if (tag.context == ASID_KERNEL) {	217	if (tag.context == ASID_KERNEL) {
218	if (!tag.vpn) {	218	if (!tag.vpn) {
219	/* NULL access in kernel */	219	/* NULL access in kernel */
220	do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);	220	do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
221	}	221	}
222	do_fast_data_access_mmu_miss_fault(istate, "Unexpected kernel page fault.");	222	do_fast_data_access_mmu_miss_fault(istate, "Unexpected kernel page fault.");
223	}	223	}
224		224
225	page_table_lock(AS, true);	225	page_table_lock(AS, true);
226	t = page_mapping_find(AS, va);	226	t = page_mapping_find(AS, va);
227	if (t) {	227	if (t) {
228	/*	228	/*
229	* The mapping was found in the software page hash table.	229	* The mapping was found in the software page hash table.
230	* Insert it into DTLB.	230	* Insert it into DTLB.
231	*/	231	*/
232	t->a = true;	232	t->a = true;
233	dtlb_pte_copy(t, true);	233	dtlb_pte_copy(t, true);
234	page_table_unlock(AS, true);	234	page_table_unlock(AS, true);
235	} else {	235	} else {
236	/*	236	/*
237	* Forward the page fault to the address space page fault handler.	237	* Forward the page fault to the address space page fault handler.
238	*/	238	*/
239	page_table_unlock(AS, true);	239	page_table_unlock(AS, true);
240	if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {	240	if (as_page_fault(va, PF_ACCESS_READ, istate) == AS_PF_FAULT) {
241	do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);	241	do_fast_data_access_mmu_miss_fault(istate, __FUNCTION__);
242	}	242	}
243	}	243	}
244	}	244	}
245		245
246	/** DTLB protection fault handler. */	246	/** DTLB protection fault handler. */
247	void fast_data_access_protection(int n, istate_t *istate)	247	void fast_data_access_protection(int n, istate_t *istate)
248	{	248	{
249	tlb_tag_access_reg_t tag;	249	tlb_tag_access_reg_t tag;
250	uintptr_t va;	250	uintptr_t va;
251	pte_t *t;	251	pte_t *t;
252		252
253	tag.value = dtlb_tag_access_read();	253	tag.value = dtlb_tag_access_read();
254	va = tag.vpn * PAGE_SIZE;	254	va = tag.vpn * PAGE_SIZE;
255		255
256	page_table_lock(AS, true);	256	page_table_lock(AS, true);
257	t = page_mapping_find(AS, va);	257	t = page_mapping_find(AS, va);
258	if (t && PTE_WRITABLE(t)) {	258	if (t && PTE_WRITABLE(t)) {
259	/*	259	/*
260	* The mapping was found in the software page hash table and is writable.	260	* The mapping was found in the software page hash table and is writable.
261	* Demap the old mapping and insert an updated mapping into DTLB.	261	* Demap the old mapping and insert an updated mapping into DTLB.
262	*/	262	*/
263	t->a = true;	263	t->a = true;
264	t->d = true;	264	t->d = true;
265	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, va);	265	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, va);
266	dtlb_pte_copy(t, false);	266	dtlb_pte_copy(t, false);
267	page_table_unlock(AS, true);	267	page_table_unlock(AS, true);
268	} else {	268	} else {
269	/*	269	/*
270	* Forward the page fault to the address space page fault handler.	270	* Forward the page fault to the address space page fault handler.
271	*/	271	*/
272	page_table_unlock(AS, true);	272	page_table_unlock(AS, true);
273	if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {	273	if (as_page_fault(va, PF_ACCESS_WRITE, istate) == AS_PF_FAULT) {
274	do_fast_data_access_protection_fault(istate, __FUNCTION__);	274	do_fast_data_access_protection_fault(istate, __FUNCTION__);
275	}	275	}
276	}	276	}
277	}	277	}
278		278
279	/** Print contents of both TLBs. */	279	/** Print contents of both TLBs. */
280	void tlb_print(void)	280	void tlb_print(void)
281	{	281	{
282	int i;	282	int i;
283	tlb_data_t d;	283	tlb_data_t d;
284	tlb_tag_read_reg_t t;	284	tlb_tag_read_reg_t t;
285		285
286	printf("I-TLB contents:\n");	286	printf("I-TLB contents:\n");
287	for (i = 0; i < ITLB_ENTRY_COUNT; i++) {	287	for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
288	d.value = itlb_data_access_read(i);	288	d.value = itlb_data_access_read(i);
289	t.value = itlb_tag_read_read(i);	289	t.value = itlb_tag_read_read(i);
290		290
291	printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",	291	printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
292	i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);	292	i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
293	}	293	}
294		294
295	printf("D-TLB contents:\n");	295	printf("D-TLB contents:\n");
296	for (i = 0; i < DTLB_ENTRY_COUNT; i++) {	296	for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
297	d.value = dtlb_data_access_read(i);	297	d.value = dtlb_data_access_read(i);
298	t.value = dtlb_tag_read_read(i);	298	t.value = dtlb_tag_read_read(i);
299		299
300	printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",	300	printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, ie=%d, soft2=%#x, diag=%#x, pfn=%#x, soft=%#x, l=%d, cp=%d, cv=%d, e=%d, p=%d, w=%d, g=%d\n",
301	i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);	301	i, t.vpn, t.context, d.v, d.size, d.nfo, d.ie, d.soft2, d.diag, d.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
302	}	302	}
303		303
304	}	304	}
305		305
306	void do_fast_instruction_access_mmu_miss_fault(istate_t istate, const char str)	306	void do_fast_instruction_access_mmu_miss_fault(istate_t istate, const char str)
307	{	307	{
308	char *tpc_str = get_symtab_entry(istate->tpc);	308	char *tpc_str = get_symtab_entry(istate->tpc);
309		309
310	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);	310	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
311	panic("%s\n", str);	311	panic("%s\n", str);
312	}	312	}
313		313
314	void do_fast_data_access_mmu_miss_fault(istate_t istate, const char str)	314	void do_fast_data_access_mmu_miss_fault(istate_t istate, const char str)
315	{	315	{
316	tlb_tag_access_reg_t tag;	316	tlb_tag_access_reg_t tag;
317	uintptr_t va;	317	uintptr_t va;
318	char *tpc_str = get_symtab_entry(istate->tpc);	318	char *tpc_str = get_symtab_entry(istate->tpc);
319		319
320	tag.value = dtlb_tag_access_read();	320	tag.value = dtlb_tag_access_read();
321	va = tag.vpn * PAGE_SIZE;	321	va = tag.vpn * PAGE_SIZE;
322		322
323	printf("Faulting page: %p, ASID=%d\n", va, tag.context);	323	printf("Faulting page: %p, ASID=%d\n", va, tag.context);
324	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);	324	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
325	panic("%s\n", str);	325	panic("%s\n", str);
326	}	326	}
327		327
328	void do_fast_data_access_protection_fault(istate_t istate, const char str)	328	void do_fast_data_access_protection_fault(istate_t istate, const char str)
329	{	329	{
330	tlb_tag_access_reg_t tag;	330	tlb_tag_access_reg_t tag;
331	uintptr_t va;	331	uintptr_t va;
332	char *tpc_str = get_symtab_entry(istate->tpc);	332	char *tpc_str = get_symtab_entry(istate->tpc);
333		333
334	tag.value = dtlb_tag_access_read();	334	tag.value = dtlb_tag_access_read();
335	va = tag.vpn * PAGE_SIZE;	335	va = tag.vpn * PAGE_SIZE;
336		336
337	printf("Faulting page: %p, ASID=%d\n", va, tag.context);	337	printf("Faulting page: %p, ASID=%d\n", va, tag.context);
338	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);	338	printf("TPC=%p, (%s)\n", istate->tpc, tpc_str);
339	panic("%s\n", str);	339	panic("%s\n", str);
340	}	340	}
341		341
342	/** Invalidate all unlocked ITLB and DTLB entries. */	342	/** Invalidate all unlocked ITLB and DTLB entries. */
343	void tlb_invalidate_all(void)	343	void tlb_invalidate_all(void)
344	{	344	{
345	int i;	345	int i;
346	tlb_data_t d;	346	tlb_data_t d;
347	tlb_tag_read_reg_t t;	347	tlb_tag_read_reg_t t;
348		348
349	for (i = 0; i < ITLB_ENTRY_COUNT; i++) {	349	for (i = 0; i < ITLB_ENTRY_COUNT; i++) {
350	d.value = itlb_data_access_read(i);	350	d.value = itlb_data_access_read(i);
351	if (!d.l) {	351	if (!d.l) {
352	t.value = itlb_tag_read_read(i);	352	t.value = itlb_tag_read_read(i);
353	d.v = false;	353	d.v = false;
354	itlb_tag_access_write(t.value);	354	itlb_tag_access_write(t.value);
355	itlb_data_access_write(i, d.value);	355	itlb_data_access_write(i, d.value);
356	}	356	}
357	}	357	}
358		358
359	for (i = 0; i < DTLB_ENTRY_COUNT; i++) {	359	for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
360	d.value = dtlb_data_access_read(i);	360	d.value = dtlb_data_access_read(i);
361	if (!d.l) {	361	if (!d.l) {
362	t.value = dtlb_tag_read_read(i);	362	t.value = dtlb_tag_read_read(i);
363	d.v = false;	363	d.v = false;
364	dtlb_tag_access_write(t.value);	364	dtlb_tag_access_write(t.value);
365	dtlb_data_access_write(i, d.value);	365	dtlb_data_access_write(i, d.value);
366	}	366	}
367	}	367	}
368		368
369	}	369	}
370		370
371	/** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).	371	/** Invalidate all ITLB and DTLB entries that belong to specified ASID (Context).
372	*	372	*
373	* @param asid Address Space ID.	373	* @param asid Address Space ID.
374	*/	374	*/
375	void tlb_invalidate_asid(asid_t asid)	375	void tlb_invalidate_asid(asid_t asid)
376	{	376	{
377	tlb_context_reg_t sc_save, ctx;	377	tlb_context_reg_t sc_save, ctx;
378		378
379	ctx.v = sc_save.v = mmu_secondary_context_read();	379	ctx.v = sc_save.v = mmu_secondary_context_read();
380	ctx.context = asid;	380	ctx.context = asid;
381	mmu_secondary_context_write(ctx.v);	381	mmu_secondary_context_write(ctx.v);
382		382
383	itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);	383	itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);
384	dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);	384	dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_SECONDARY, 0);
385		385
386	mmu_secondary_context_write(sc_save.v);	386	mmu_secondary_context_write(sc_save.v);
387	}	387	}
388		388
389	/** Invalidate all ITLB and DTLB entries for specified page range in specified address space.	389	/** Invalidate all ITLB and DTLB entries for specified page range in specified address space.
390	*	390	*
391	* @param asid Address Space ID.	391	* @param asid Address Space ID.
392	* @param page First page which to sweep out from ITLB and DTLB.	392	* @param page First page which to sweep out from ITLB and DTLB.
393	* @param cnt Number of ITLB and DTLB entries to invalidate.	393	* @param cnt Number of ITLB and DTLB entries to invalidate.
394	*/	394	*/
395	void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)	395	void tlb_invalidate_pages(asid_t asid, uintptr_t page, count_t cnt)
396	{	396	{
397	int i;	397	int i;
398	tlb_context_reg_t sc_save, ctx;	398	tlb_context_reg_t sc_save, ctx;
399		399
400	ctx.v = sc_save.v = mmu_secondary_context_read();	400	ctx.v = sc_save.v = mmu_secondary_context_read();
401	ctx.context = asid;	401	ctx.context = asid;
402	mmu_secondary_context_write(ctx.v);	402	mmu_secondary_context_write(ctx.v);
403		403
404	for (i = 0; i < cnt; i++) {	404	for (i = 0; i < cnt; i++) {
405	itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);	405	itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);
406	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);	406	dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_SECONDARY, page + i * PAGE_SIZE);
407	}	407	}
408		408
409	mmu_secondary_context_write(sc_save.v);	409	mmu_secondary_context_write(sc_save.v);
410	}	410	}
411		411
412	/** @}	412	/** @}
413	*/	413	*/
414		414

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