/*
* Copyright (c) 2005 Jakub Jermar
* Copyright (c) 2008 Pavel Rimsky
* 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 <mm/tlb.h>
#include <mm/as.h>
#include <mm/asid.h>
#include <arch/sun4v/hypercall.h>
#include <arch/mm/frame.h>
#include <arch/mm/page.h>
#include <arch/mm/tte.h>
#include <arch/mm/tlb.h>
#include <arch/interrupt.h>
#include <interrupt.h>
#include <arch.h>
#include <print.h>
#include <arch/types.h>
#include <config.h>
#include <arch/trap/trap.h>
#include <arch/trap/exception.h>
#include <panic.h>
#include <arch/asm.h>
#include <arch/cpu.h>
#include <arch/mm/pagesize.h>
#ifdef CONFIG_TSB
#include <arch/mm/tsb.h>
#endif
static void itlb_pte_copy(pte_t *);
static void dtlb_pte_copy(pte_t *, bool);
static void do_fast_instruction_access_mmu_miss_fault(istate_t *, const char *);
static void do_fast_data_access_mmu_miss_fault(istate_t *, uint64_t,
const char *);
static void do_fast_data_access_protection_fault(istate_t *,
uint64_t, const char *);
#if 0
char *context_encoding[] = {
"Primary",
"Secondary",
"Nucleus",
"Reserved"
};
#endif
/*
* The assembly language routine passes a 64-bit parameter to the Data Access
* MMU Miss and Data Access protection handlers, the parameter encapsulates
* a virtual address of the faulting page and the faulting context. The most
* significant 51 bits represent the VA of the faulting page and the least
* significant 13 vits represent the faulting context. The following macros
* extract the page and context out of the 64-bit parameter:
*/
/* extracts the VA of the faulting page */
#define DMISS_ADDRESS(page_and_ctx) (((page_and_ctx) >> 13) << 13)
/* extracts the faulting context */
#define DMISS_CONTEXT(page_and_ctx) ((page_and_ctx) & 0x1fff)
/*
* Invalidate all non-locked DTLB and ITLB entries.
*/
void tlb_arch_init(void)
{
tlb_invalidate_all();
}
/** 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)
{
#if 0
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.context = 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;
#ifdef CONFIG_VIRT_IDX_DCACHE
data.cv = cacheable;
#endif /* CONFIG_VIRT_IDX_DCACHE */
data.p = true;
data.w = true;
data.g = false;
dtlb_data_in_write(data.value);
#endif
}
/** 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)
{
tte_data_t data;
data.value = 0;
data.v = true;
data.nfo = false;
data.ra = (t->frame) >> FRAME_WIDTH;
data.ie = false;
data.e = false;
data.cp = t->c;
#ifdef CONFIG_VIRT_IDX_DCACHE
data.cv = t->c;
#endif
data.p = t->k;
data.x = false;
data.w = ro ? false : t->w;
data.size = PAGESIZE_8K;
__hypercall_hyperfast(
t->page, t->as->asid, data.value, MMU_FLAG_DTLB, 0, MMU_MAP_ADDR);
}
/** Copy PTE to ITLB.
*
* @param t Page Table Entry to be copied.
*/
void itlb_pte_copy(pte_t *t)
{
tte_data_t data;
data.value = 0;
data.v = true;
data.nfo = false;
data.ra = (t->frame) >> FRAME_WIDTH;
data.ie = false;
data.e = false;
data.cp = t->c;
data.cv = false;
data.p = t->k;
data.x = true;
data.w = false;
data.size = PAGESIZE_8K;
__hypercall_hyperfast(
t->page, t->as->asid, data.value, MMU_FLAG_ITLB, 0, MMU_MAP_ADDR);
}
/** ITLB miss handler. */
void fast_instruction_access_mmu_miss(unative_t unused, 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);
#ifdef CONFIG_TSB
//itsb_pte_copy(t, index);
#endif
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,
__func__);
}
}
}
/** 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.
*
* @param page_and_ctx A 64-bit value describing the fault. The most
* significant 51 bits of the value contain the virtual
* address which caused the fault truncated to the page
* boundary. The least significant 13 bits of the value
* contain the number of the context in which the fault
* occurred.
* @param istate Interrupted state saved on the stack.
*/
void fast_data_access_mmu_miss(uint64_t page_and_ctx, istate_t *istate)
{
pte_t *t;
uintptr_t va = DMISS_ADDRESS(page_and_ctx);
uint16_t ctx = DMISS_CONTEXT(page_and_ctx);
if (ctx == ASID_KERNEL) {
if (va == 0) {
/* NULL access in kernel */
do_fast_data_access_mmu_miss_fault(istate, page_and_ctx,
__func__);
}
do_fast_data_access_mmu_miss_fault(istate, page_and_ctx, "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);
#ifdef CONFIG_TSB
//dtsb_pte_copy(t, true);
#endif
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, page_and_ctx,
__func__);
}
}
}
/** DTLB protection fault handler.
*
* @param page_and_ctx A 64-bit value describing the fault. The most
* significant 51 bits of the value contain the virtual
* address which caused the fault truncated to the page
* boundary. The least significant 13 bits of the value
* contain the number of the context in which the fault
* occurred.
* @param istate Interrupted state saved on the stack.
*/
void fast_data_access_protection(uint64_t page_and_ctx, istate_t *istate)
{
pte_t *t;
uintptr_t va = DMISS_ADDRESS(page_and_ctx);
uint16_t ctx = DMISS_CONTEXT(page_and_ctx);
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;
mmu_demap_page(va, ctx, MMU_FLAG_DTLB);
dtlb_pte_copy(t, false);
#ifdef CONFIG_TSB
//dtsb_pte_copy(t, false);
#endif
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, page_and_ctx,
__func__);
}
}
}
/** Print TLB entry (for debugging purposes).
*
* The diag field has been left out in order to make this function more generic
* (there is no diag field in US3 architeture).
*
* @param i TLB entry number
* @param t TLB entry tag
* @param d TLB entry data
*/
#if 0
static void print_tlb_entry(int i, tlb_tag_read_reg_t t, tlb_data_t d)
{
printf("%d: vpn=%#llx, context=%d, v=%d, size=%d, nfo=%d, " "ie=%d, soft2=%#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.pfn, d.soft, d.l, d.cp, d.cv, d.e, d.p, d.w, d.g);
}
#endif
void tlb_print(void)
{
#if 0
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);
t.value = itlb_tag_read_read(i);
print_tlb_entry(i, t, d);
}
for (i = 0; i < DTLB_ENTRY_COUNT; i++) {
d.value = dtlb_data_access_read(i);
t.value = dtlb_tag_read_read(i);
print_tlb_entry(i, t, d);
}
#endif
}
void do_fast_instruction_access_mmu_miss_fault(istate_t *istate,
const char *str)
{
fault_if_from_uspace(istate, "%s\n", str);
dump_istate(istate);
panic("%s\n", str);
}
void do_fast_data_access_mmu_miss_fault(istate_t *istate,
uint64_t page_and_ctx, const char *str)
{
if (DMISS_CONTEXT(page_and_ctx)) {
fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, DMISS_ADDRESS(page_and_ctx),
DMISS_CONTEXT(page_and_ctx));
}
dump_istate(istate);
printf("Faulting page: %p, ASID=%d\n", DMISS_ADDRESS
(page_and_ctx
), DMISS_CONTEXT
(page_and_ctx
)); panic("%s\n", str);
}
void do_fast_data_access_protection_fault(istate_t *istate,
uint64_t page_and_ctx, const char *str)
{
if (DMISS_CONTEXT(page_and_ctx)) {
fault_if_from_uspace(istate, "%s, Page=%p (ASID=%d)\n", str, DMISS_ADDRESS(page_and_ctx),
DMISS_CONTEXT(page_and_ctx));
}
printf("Faulting page: %p, ASID=%d\n", DMISS_ADDRESS
(page_and_ctx
), DMISS_CONTEXT
(page_and_ctx
)); dump_istate(istate);
panic("%s\n", str);
}
void describe_mmu_fault(void)
{
}
/** Invalidate all unlocked ITLB and DTLB entries. */
void tlb_invalidate_all(void)
{
uint64_t errno = __hypercall_fast3(MMU_DEMAP_ALL, 0, 0,
MMU_FLAG_DTLB | MMU_FLAG_ITLB);
if (errno != EOK) {
panic("Error code = %d.\n", errno);
}
}
/** Invalidate all ITLB and DTLB entries that belong to specified ASID
* (Context).
*
* @param asid Address Space ID.
*/
void tlb_invalidate_asid(asid_t asid)
{
#if 0
tlb_context_reg_t pc_save, ctx;
/* switch to nucleus because we are mapped by the primary context */
nucleus_enter();
ctx.v = pc_save.v = mmu_primary_context_read();
ctx.context = asid;
mmu_primary_context_write(ctx.v);
itlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);
dtlb_demap(TLB_DEMAP_CONTEXT, TLB_DEMAP_PRIMARY, 0);
mmu_primary_context_write(pc_save.v);
nucleus_leave();
#endif
}
/** 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)
{
#if 0
unsigned int i;
tlb_context_reg_t pc_save, ctx;
/* switch to nucleus because we are mapped by the primary context */
nucleus_enter();
ctx.v = pc_save.v = mmu_primary_context_read();
ctx.context = asid;
mmu_primary_context_write(ctx.v);
for (i = 0; i < cnt * MMU_PAGES_PER_PAGE; i++) {
itlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,
page + i * MMU_PAGE_SIZE);
dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_PRIMARY,
page + i * MMU_PAGE_SIZE);
}
mmu_primary_context_write(pc_save.v);
nucleus_leave();
#endif
}
/** @}
*/