MIPS: Allow ASID size to be determined at boot time.
Original patch by Ralf Baechle and removed by Harold Koerfgen
with commit f67e4ffc79905482c3b9b8c8dd65197bac7eb508. This
allows for more generic kernels since the size of the ASID
and corresponding masks can be determined at run-time. This
patch is also required for the new Aptiv cores and has been
tested on Malta and Malta Aptiv platforms.
[ralf@linux-mips.org: Added relevant part of fix
https://patchwork.linux-mips.org/patch/5213/]
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mmu_context.h
index e81d719..bab1980 100644
--- a/arch/mips/include/asm/mmu_context.h
+++ b/arch/mips/include/asm/mmu_context.h
@@ -62,45 +62,68 @@
TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir)
#endif
#endif /* CONFIG_MIPS_PGD_C0_CONTEXT*/
-#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
-#define ASID_INC 0x40
-#define ASID_MASK 0xfc0
+#define ASID_INC(asid) \
+({ \
+ unsigned long __asid = asid; \
+ __asm__("1:\taddiu\t%0,1\t\t\t\t# patched\n\t" \
+ ".section\t__asid_inc,\"a\"\n\t" \
+ ".word\t1b\n\t" \
+ ".previous" \
+ :"=r" (__asid) \
+ :"0" (__asid)); \
+ __asid; \
+})
+#define ASID_MASK(asid) \
+({ \
+ unsigned long __asid = asid; \
+ __asm__("1:\tandi\t%0,%1,0xfc0\t\t\t# patched\n\t" \
+ ".section\t__asid_mask,\"a\"\n\t" \
+ ".word\t1b\n\t" \
+ ".previous" \
+ :"=r" (__asid) \
+ :"r" (__asid)); \
+ __asid; \
+})
+#define ASID_VERSION_MASK \
+({ \
+ unsigned long __asid; \
+ __asm__("1:\taddiu\t%0,$0,0xff00\t\t\t\t# patched\n\t" \
+ ".section\t__asid_version_mask,\"a\"\n\t" \
+ ".word\t1b\n\t" \
+ ".previous" \
+ :"=r" (__asid)); \
+ __asid; \
+})
+#define ASID_FIRST_VERSION \
+({ \
+ unsigned long __asid = asid; \
+ __asm__("1:\tli\t%0,0x100\t\t\t\t# patched\n\t" \
+ ".section\t__asid_first_version,\"a\"\n\t" \
+ ".word\t1b\n\t" \
+ ".previous" \
+ :"=r" (__asid)); \
+ __asid; \
+})
-#elif defined(CONFIG_CPU_R8000)
+#define ASID_FIRST_VERSION_R3000 0x1000
+#define ASID_FIRST_VERSION_R4000 0x100
+#define ASID_FIRST_VERSION_R8000 0x1000
+#define ASID_FIRST_VERSION_RM9000 0x1000
-#define ASID_INC 0x10
-#define ASID_MASK 0xff0
-
-#elif defined(CONFIG_MIPS_MT_SMTC)
-
-#define ASID_INC 0x1
-extern unsigned long smtc_asid_mask;
-#define ASID_MASK (smtc_asid_mask)
-#define HW_ASID_MASK 0xff
-/* End SMTC/34K debug hack */
-#else /* FIXME: not correct for R6000 */
-
-#define ASID_INC 0x1
-#define ASID_MASK 0xff
-
+#ifdef CONFIG_MIPS_MT_SMTC
+#define SMTC_HW_ASID_MASK 0xff
+extern unsigned int smtc_asid_mask;
#endif
#define cpu_context(cpu, mm) ((mm)->context.asid[cpu])
-#define cpu_asid(cpu, mm) (cpu_context((cpu), (mm)) & ASID_MASK)
+#define cpu_asid(cpu, mm) ASID_MASK(cpu_context((cpu), (mm)))
#define asid_cache(cpu) (cpu_data[cpu].asid_cache)
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
}
-/*
- * All unused by hardware upper bits will be considered
- * as a software asid extension.
- */
-#define ASID_VERSION_MASK ((unsigned long)~(ASID_MASK|(ASID_MASK-1)))
-#define ASID_FIRST_VERSION ((unsigned long)(~ASID_VERSION_MASK) + 1)
-
#ifndef CONFIG_MIPS_MT_SMTC
/* Normal, classic MIPS get_new_mmu_context */
static inline void
@@ -108,7 +131,7 @@
{
unsigned long asid = asid_cache(cpu);
- if (! ((asid += ASID_INC) & ASID_MASK) ) {
+ if (!ASID_MASK((asid = ASID_INC(asid)))) {
if (cpu_has_vtag_icache)
flush_icache_all();
local_flush_tlb_all(); /* start new asid cycle */
@@ -166,7 +189,7 @@
* free up the ASID value for use and flush any old
* instances of it from the TLB.
*/
- oldasid = (read_c0_entryhi() & ASID_MASK);
+ oldasid = ASID_MASK(read_c0_entryhi());
if(smtc_live_asid[mytlb][oldasid]) {
smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
if(smtc_live_asid[mytlb][oldasid] == 0)
@@ -177,7 +200,7 @@
* having ASID_MASK smaller than the hardware maximum,
* make sure no "soft" bits become "hard"...
*/
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) |
+ write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK) |
cpu_asid(cpu, next));
ehb(); /* Make sure it propagates to TCStatus */
evpe(mtflags);
@@ -230,15 +253,15 @@
#ifdef CONFIG_MIPS_MT_SMTC
/* See comments for similar code above */
mtflags = dvpe();
- oldasid = read_c0_entryhi() & ASID_MASK;
+ oldasid = ASID_MASK(read_c0_entryhi());
if(smtc_live_asid[mytlb][oldasid]) {
smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
if(smtc_live_asid[mytlb][oldasid] == 0)
smtc_flush_tlb_asid(oldasid);
}
/* See comments for similar code above */
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK) |
- cpu_asid(cpu, next));
+ write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK) |
+ cpu_asid(cpu, next));
ehb(); /* Make sure it propagates to TCStatus */
evpe(mtflags);
#else
@@ -275,14 +298,14 @@
#ifdef CONFIG_MIPS_MT_SMTC
/* See comments for similar code above */
prevvpe = dvpe();
- oldasid = (read_c0_entryhi() & ASID_MASK);
+ oldasid = ASID_MASK(read_c0_entryhi());
if (smtc_live_asid[mytlb][oldasid]) {
smtc_live_asid[mytlb][oldasid] &= ~(0x1 << cpu);
if(smtc_live_asid[mytlb][oldasid] == 0)
smtc_flush_tlb_asid(oldasid);
}
/* See comments for similar code above */
- write_c0_entryhi((read_c0_entryhi() & ~HW_ASID_MASK)
+ write_c0_entryhi((read_c0_entryhi() & ~SMTC_HW_ASID_MASK)
| cpu_asid(cpu, mm));
ehb(); /* Make sure it propagates to TCStatus */
evpe(prevvpe);
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index ecb347c..5360b1d 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -480,7 +480,7 @@
.set noreorder
/* check if TLB contains a entry for EPC */
MFC0 k1, CP0_ENTRYHI
- andi k1, 0xff /* ASID_MASK */
+ andi k1, 0xff /* ASID_MASK patched at run-time!! */
MFC0 k0, CP0_EPC
PTR_SRL k0, _PAGE_SHIFT + 1
PTR_SLL k0, _PAGE_SHIFT + 1
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 7186222..31d22f3 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -111,7 +111,7 @@
static int ipibuffers;
static int nostlb;
static int asidmask;
-unsigned long smtc_asid_mask = 0xff;
+unsigned int smtc_asid_mask = 0xff;
static int __init vpe0tcs(char *str)
{
@@ -1395,7 +1395,7 @@
asid = asid_cache(cpu);
do {
- if (!((asid += ASID_INC) & ASID_MASK) ) {
+ if (!ASID_MASK(ASID_INC(asid))) {
if (cpu_has_vtag_icache)
flush_icache_all();
/* Traverse all online CPUs (hack requires contiguous range) */
@@ -1414,7 +1414,7 @@
mips_ihb();
}
tcstat = read_tc_c0_tcstatus();
- smtc_live_asid[tlb][(tcstat & ASID_MASK)] |= (asiduse)(0x1 << i);
+ smtc_live_asid[tlb][ASID_MASK(tcstat)] |= (asiduse)(0x1 << i);
if (!prevhalt)
write_tc_c0_tchalt(0);
}
@@ -1423,7 +1423,7 @@
asid = ASID_FIRST_VERSION;
local_flush_tlb_all(); /* start new asid cycle */
}
- } while (smtc_live_asid[tlb][(asid & ASID_MASK)]);
+ } while (smtc_live_asid[tlb][ASID_MASK(asid)]);
/*
* SMTC shares the TLB within VPEs and possibly across all VPEs.
@@ -1461,7 +1461,7 @@
tlb_read();
ehb();
ehi = read_c0_entryhi();
- if ((ehi & ASID_MASK) == asid) {
+ if (ASID_MASK(ehi) == asid) {
/*
* Invalidate only entries with specified ASID,
* makiing sure all entries differ.
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index c3abb88..4b6b607 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -1547,6 +1547,7 @@
unsigned int cpu = smp_processor_id();
unsigned int status_set = ST0_CU0;
unsigned int hwrena = cpu_hwrena_impl_bits;
+ unsigned long asid = 0;
#ifdef CONFIG_MIPS_MT_SMTC
int secondaryTC = 0;
int bootTC = (cpu == 0);
@@ -1630,8 +1631,9 @@
}
#endif /* CONFIG_MIPS_MT_SMTC */
- if (!cpu_data[cpu].asid_cache)
- cpu_data[cpu].asid_cache = ASID_FIRST_VERSION;
+ asid = ASID_FIRST_VERSION;
+ cpu_data[cpu].asid_cache = asid;
+ TLBMISS_HANDLER_SETUP();
atomic_inc(&init_mm.mm_count);
current->active_mm = &init_mm;
diff --git a/arch/mips/lib/dump_tlb.c b/arch/mips/lib/dump_tlb.c
index 32b9f21..8a12d00 100644
--- a/arch/mips/lib/dump_tlb.c
+++ b/arch/mips/lib/dump_tlb.c
@@ -11,6 +11,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlbdebug.h>
+#include <asm/mmu_context.h>
static inline const char *msk2str(unsigned int mask)
{
@@ -55,7 +56,7 @@
s_pagemask = read_c0_pagemask();
s_entryhi = read_c0_entryhi();
s_index = read_c0_index();
- asid = s_entryhi & 0xff;
+ asid = ASID_MASK(s_entryhi);
for (i = first; i <= last; i++) {
write_c0_index(i);
@@ -85,7 +86,7 @@
printk("va=%0*lx asid=%02lx\n",
width, (entryhi & ~0x1fffUL),
- entryhi & 0xff);
+ ASID_MASK(entryhi));
printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",
width,
(entrylo0 << 6) & PAGE_MASK, c0,
diff --git a/arch/mips/lib/r3k_dump_tlb.c b/arch/mips/lib/r3k_dump_tlb.c
index 91615c2..8327698 100644
--- a/arch/mips/lib/r3k_dump_tlb.c
+++ b/arch/mips/lib/r3k_dump_tlb.c
@@ -9,6 +9,7 @@
#include <linux/mm.h>
#include <asm/mipsregs.h>
+#include <asm/mmu_context.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlbdebug.h>
@@ -21,7 +22,7 @@
unsigned int asid;
unsigned long entryhi, entrylo0;
- asid = read_c0_entryhi() & 0xfc0;
+ asid = ASID_MASK(read_c0_entryhi());
for (i = first; i <= last; i++) {
write_c0_index(i<<8);
@@ -35,7 +36,7 @@
/* Unused entries have a virtual address of KSEG0. */
if ((entryhi & 0xffffe000) != 0x80000000
- && (entryhi & 0xfc0) == asid) {
+ && (ASID_MASK(entryhi) == asid)) {
/*
* Only print entries in use
*/
@@ -44,7 +45,7 @@
printk("va=%08lx asid=%08lx"
" [pa=%06lx n=%d d=%d v=%d g=%d]",
(entryhi & 0xffffe000),
- entryhi & 0xfc0,
+ ASID_MASK(entryhi),
entrylo0 & PAGE_MASK,
(entrylo0 & (1 << 11)) ? 1 : 0,
(entrylo0 & (1 << 10)) ? 1 : 0,
diff --git a/arch/mips/mm/tlb-r3k.c b/arch/mips/mm/tlb-r3k.c
index a63d1ed..4a13c15 100644
--- a/arch/mips/mm/tlb-r3k.c
+++ b/arch/mips/mm/tlb-r3k.c
@@ -51,7 +51,7 @@
#endif
local_irq_save(flags);
- old_ctx = read_c0_entryhi() & ASID_MASK;
+ old_ctx = ASID_MASK(read_c0_entryhi());
write_c0_entrylo0(0);
entry = r3k_have_wired_reg ? read_c0_wired() : 8;
for (; entry < current_cpu_data.tlbsize; entry++) {
@@ -87,13 +87,13 @@
#ifdef DEBUG_TLB
printk("[tlbrange<%lu,0x%08lx,0x%08lx>]",
- cpu_context(cpu, mm) & ASID_MASK, start, end);
+ ASID_MASK(cpu_context(cpu, mm)), start, end);
#endif
local_irq_save(flags);
size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
if (size <= current_cpu_data.tlbsize) {
- int oldpid = read_c0_entryhi() & ASID_MASK;
- int newpid = cpu_context(cpu, mm) & ASID_MASK;
+ int oldpid = ASID_MASK(read_c0_entryhi());
+ int newpid = ASID_MASK(cpu_context(cpu, mm));
start &= PAGE_MASK;
end += PAGE_SIZE - 1;
@@ -166,10 +166,10 @@
#ifdef DEBUG_TLB
printk("[tlbpage<%lu,0x%08lx>]", cpu_context(cpu, vma->vm_mm), page);
#endif
- newpid = cpu_context(cpu, vma->vm_mm) & ASID_MASK;
+ newpid = ASID_MASK(cpu_context(cpu, vma->vm_mm));
page &= PAGE_MASK;
local_irq_save(flags);
- oldpid = read_c0_entryhi() & ASID_MASK;
+ oldpid = ASID_MASK(read_c0_entryhi());
write_c0_entryhi(page | newpid);
BARRIER;
tlb_probe();
@@ -197,10 +197,10 @@
if (current->active_mm != vma->vm_mm)
return;
- pid = read_c0_entryhi() & ASID_MASK;
+ pid = ASID_MASK(read_c0_entryhi());
#ifdef DEBUG_TLB
- if ((pid != (cpu_context(cpu, vma->vm_mm) & ASID_MASK)) || (cpu_context(cpu, vma->vm_mm) == 0)) {
+ if ((pid != ASID_MASK(cpu_context(cpu, vma->vm_mm))) || (cpu_context(cpu, vma->vm_mm) == 0)) {
printk("update_mmu_cache: Wheee, bogus tlbpid mmpid=%lu tlbpid=%d\n",
(cpu_context(cpu, vma->vm_mm)), pid);
}
@@ -241,7 +241,7 @@
local_irq_save(flags);
/* Save old context and create impossible VPN2 value */
- old_ctx = read_c0_entryhi() & ASID_MASK;
+ old_ctx = ASID_MASK(read_c0_entryhi());
old_pagemask = read_c0_pagemask();
w = read_c0_wired();
write_c0_wired(w + 1);
@@ -264,7 +264,7 @@
#endif
local_irq_save(flags);
- old_ctx = read_c0_entryhi() & ASID_MASK;
+ old_ctx = ASID_MASK(read_c0_entryhi());
write_c0_entrylo0(entrylo0);
write_c0_entryhi(entryhi);
write_c0_index(wired);
diff --git a/arch/mips/mm/tlb-r4k.c b/arch/mips/mm/tlb-r4k.c
index 493131c..3d03a2c 100644
--- a/arch/mips/mm/tlb-r4k.c
+++ b/arch/mips/mm/tlb-r4k.c
@@ -285,7 +285,7 @@
ENTER_CRITICAL(flags);
- pid = read_c0_entryhi() & ASID_MASK;
+ pid = ASID_MASK(read_c0_entryhi());
address &= (PAGE_MASK << 1);
write_c0_entryhi(address | pid);
pgdp = pgd_offset(vma->vm_mm, address);
diff --git a/arch/mips/mm/tlb-r8k.c b/arch/mips/mm/tlb-r8k.c
index 91c2499..122f920 100644
--- a/arch/mips/mm/tlb-r8k.c
+++ b/arch/mips/mm/tlb-r8k.c
@@ -195,7 +195,7 @@
if (current->active_mm != vma->vm_mm)
return;
- pid = read_c0_entryhi() & ASID_MASK;
+ pid = ASID_MASK(read_c0_entryhi());
local_irq_save(flags);
address &= PAGE_MASK;
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index 820e661..e2a9e36 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -29,6 +29,7 @@
#include <linux/init.h>
#include <linux/cache.h>
+#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
#include <asm/pgtable.h>
#include <asm/war.h>
@@ -305,6 +306,48 @@
static int check_for_high_segbits __cpuinitdata;
#endif
+static void __cpuinit insn_fixup(unsigned int **start, unsigned int **stop,
+ unsigned int i_const)
+{
+ unsigned int **p, *ip;
+
+ for (p = start; p < stop; p++) {
+ ip = *p;
+ *ip = (*ip & 0xffff0000) | i_const;
+ }
+ local_flush_icache_range((unsigned long)*p, (unsigned long)((*p) + 1));
+}
+
+#define asid_insn_fixup(section, const) \
+do { \
+ extern unsigned int *__start_ ## section; \
+ extern unsigned int *__stop_ ## section; \
+ insn_fixup(&__start_ ## section, &__stop_ ## section, const); \
+} while(0)
+
+/*
+ * Caller is assumed to flush the caches before the first context switch.
+ */
+static void __cpuinit setup_asid(unsigned int inc, unsigned int mask,
+ unsigned int version_mask,
+ unsigned int first_version)
+{
+ extern asmlinkage void handle_ri_rdhwr_vivt(void);
+ unsigned long *vivt_exc;
+
+ asid_insn_fixup(__asid_inc, inc);
+ asid_insn_fixup(__asid_mask, mask);
+ asid_insn_fixup(__asid_version_mask, version_mask);
+ asid_insn_fixup(__asid_first_version, first_version);
+
+ /* Patch up the 'handle_ri_rdhwr_vivt' handler. */
+ vivt_exc = (unsigned long *) &handle_ri_rdhwr_vivt;
+ vivt_exc++;
+ *vivt_exc = (*vivt_exc & ~mask) | mask;
+
+ current_cpu_data.asid_cache = first_version;
+}
+
static int check_for_high_segbits __cpuinitdata;
static unsigned int kscratch_used_mask __cpuinitdata;
@@ -2162,6 +2205,7 @@
case CPU_TX3922:
case CPU_TX3927:
#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
+ setup_asid(0x40, 0xfc0, 0xf000, ASID_FIRST_VERSION_R3000);
build_r3000_tlb_refill_handler();
if (!run_once) {
build_r3000_tlb_load_handler();
@@ -2184,6 +2228,11 @@
break;
default:
+#ifndef CONFIG_MIPS_MT_SMTC
+ setup_asid(0x1, 0xff, 0xff00, ASID_FIRST_VERSION_R4000);
+#else
+ setup_asid(0x1, smtc_asid_mask, 0xff00, ASID_FIRST_VERSION_R4000);
+#endif
if (!run_once) {
scratch_reg = allocate_kscratch();
#ifdef CONFIG_MIPS_PGD_C0_CONTEXT