diff options
Diffstat (limited to 'arch/nios2/mm/tlb.c')
| -rw-r--r-- | arch/nios2/mm/tlb.c | 68 |
1 files changed, 33 insertions, 35 deletions
diff --git a/arch/nios2/mm/tlb.c b/arch/nios2/mm/tlb.c index 99e047082993..eb568a919576 100644 --- a/arch/nios2/mm/tlb.c +++ b/arch/nios2/mm/tlb.c @@ -23,10 +23,6 @@ ((((1UL << (cpuinfo.tlb_ptr_sz - cpuinfo.tlb_num_ways_log2))) - 1) \ << PAGE_SHIFT) -/* Used as illegal PHYS_ADDR for TLB mappings - */ -#define MAX_PHYS_ADDR 0 - static void get_misc_and_pid(unsigned long *misc, unsigned long *pid) { *misc = RDCTL(CTL_TLBMISC); @@ -35,6 +31,15 @@ static void get_misc_and_pid(unsigned long *misc, unsigned long *pid) } /* + * This provides a PTEADDR value for addr that will cause a TLB miss + * (fast TLB miss). TLB invalidation replaces entries with this value. + */ +static unsigned long pteaddr_invalid(unsigned long addr) +{ + return ((addr | 0xC0000000UL) >> PAGE_SHIFT) << 2; +} + +/* * All entries common to a mm share an asid. To effectively flush these * entries, we just bump the asid. */ @@ -74,17 +79,14 @@ void flush_tlb_one_pid(unsigned long addr, unsigned long mmu_pid) pid = (tlbmisc >> TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK; if (((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) && pid == mmu_pid) { - unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE + - ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) + - (addr & TLB_INDEX_MASK); - pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n", - vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT)); + pr_debug("Flush entry by writing way=%dl pid=%ld\n", + way, (pid_misc >> TLBMISC_PID_SHIFT)); - WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2); + WRCTL(CTL_PTEADDR, pteaddr_invalid(addr)); tlbmisc = pid_misc | TLBMISC_WE | (way << TLBMISC_WAY_SHIFT); WRCTL(CTL_TLBMISC, tlbmisc); - WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT)); + WRCTL(CTL_TLBACC, 0); } } @@ -128,18 +130,14 @@ static void flush_tlb_one(unsigned long addr) tlbmisc = RDCTL(CTL_TLBMISC); if ((((pteaddr >> 2) & 0xfffff)) == (addr >> PAGE_SHIFT)) { - unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE + - ((PAGE_SIZE * cpuinfo.tlb_num_lines) * way) + - (addr & TLB_INDEX_MASK); - - pr_debug("Flush entry by writing %#lx way=%dl pid=%ld\n", - vaddr, way, (pid_misc >> TLBMISC_PID_SHIFT)); + pr_debug("Flush entry by writing way=%dl pid=%ld\n", + way, (pid_misc >> TLBMISC_PID_SHIFT)); + WRCTL(CTL_PTEADDR, pteaddr_invalid(addr)); tlbmisc = pid_misc | TLBMISC_WE | (way << TLBMISC_WAY_SHIFT); - WRCTL(CTL_PTEADDR, (vaddr >> 12) << 2); WRCTL(CTL_TLBMISC, tlbmisc); - WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT)); + WRCTL(CTL_TLBACC, 0); } } @@ -177,7 +175,7 @@ void dump_tlb_line(unsigned long line) tlbmisc = RDCTL(CTL_TLBMISC); tlbacc = RDCTL(CTL_TLBACC); - if ((tlbacc << PAGE_SHIFT) != (MAX_PHYS_ADDR & PAGE_MASK)) { + if ((tlbacc << PAGE_SHIFT) != 0) { pr_debug("-- way:%02x vpn:0x%08lx phys:0x%08lx pid:0x%02lx flags:%c%c%c%c%c\n", way, (pteaddr << (PAGE_SHIFT-2)), @@ -205,6 +203,7 @@ void dump_tlb(void) void flush_tlb_pid(unsigned long pid) { + unsigned long addr = 0; unsigned int line; unsigned int way; unsigned long org_misc, pid_misc; @@ -213,38 +212,35 @@ void flush_tlb_pid(unsigned long pid) get_misc_and_pid(&org_misc, &pid_misc); for (line = 0; line < cpuinfo.tlb_num_lines; line++) { - WRCTL(CTL_PTEADDR, line << 2); + WRCTL(CTL_PTEADDR, pteaddr_invalid(addr)); for (way = 0; way < cpuinfo.tlb_num_ways; way++) { - unsigned long pteaddr; unsigned long tlbmisc; - unsigned long tlbacc; tlbmisc = pid_misc | TLBMISC_RD | (way << TLBMISC_WAY_SHIFT); WRCTL(CTL_TLBMISC, tlbmisc); - pteaddr = RDCTL(CTL_PTEADDR); tlbmisc = RDCTL(CTL_TLBMISC); - tlbacc = RDCTL(CTL_TLBACC); if (((tlbmisc>>TLBMISC_PID_SHIFT) & TLBMISC_PID_MASK) == pid) { tlbmisc = pid_misc | TLBMISC_WE | (way << TLBMISC_WAY_SHIFT); WRCTL(CTL_TLBMISC, tlbmisc); - WRCTL(CTL_TLBACC, - (MAX_PHYS_ADDR >> PAGE_SHIFT)); + WRCTL(CTL_TLBACC, 0); } } + addr += PAGE_SIZE; + WRCTL(CTL_TLBMISC, org_misc); } } void flush_tlb_all(void) { - int i; - unsigned long vaddr = CONFIG_NIOS2_IO_REGION_BASE; + unsigned long addr = 0; + unsigned int line; unsigned int way; unsigned long org_misc, pid_misc, tlbmisc; @@ -254,14 +250,16 @@ void flush_tlb_all(void) /* Map each TLB entry to physcal address 0 with no-access and a bad ptbase */ - for (way = 0; way < cpuinfo.tlb_num_ways; way++) { - tlbmisc = pid_misc | (way << TLBMISC_WAY_SHIFT); - for (i = 0; i < cpuinfo.tlb_num_lines; i++) { - WRCTL(CTL_PTEADDR, ((vaddr) >> PAGE_SHIFT) << 2); + for (line = 0; line < cpuinfo.tlb_num_lines; line++) { + WRCTL(CTL_PTEADDR, pteaddr_invalid(addr)); + + for (way = 0; way < cpuinfo.tlb_num_ways; way++) { + tlbmisc = pid_misc | (way << TLBMISC_WAY_SHIFT); WRCTL(CTL_TLBMISC, tlbmisc); - WRCTL(CTL_TLBACC, (MAX_PHYS_ADDR >> PAGE_SHIFT)); - vaddr += 1UL << 12; + WRCTL(CTL_TLBACC, 0); } + + addr += PAGE_SIZE; } /* restore pid/way */ |