From 91dfc423cc8cfd399fb308a837102a7ab7fa067e Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Tue, 2 Feb 2010 08:52:20 -0800 Subject: MIPS: 64-bit: Detect virtual memory size Linux kernel 2.6.32 and later allocate address space from the top of the kernel virtual memory address space. This patch implements virtual memory size detection for 64 bit MIPS CPUs to avoid resulting crashes. Signed-off-by: Guenter Roeck Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/935/ Reviewed-by: David Daney Signed-off-by: Ralf Baechle --- arch/mips/include/asm/cpu-features.h | 7 +++++++ arch/mips/include/asm/cpu-info.h | 3 +++ arch/mips/include/asm/pgtable-64.h | 4 +++- arch/mips/kernel/cpu-probe.c | 11 +++++++++++ 4 files changed, 24 insertions(+), 1 deletion(-) (limited to 'arch/mips') diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h index 1f4df647c384..272c5ef35bbb 100644 --- a/arch/mips/include/asm/cpu-features.h +++ b/arch/mips/include/asm/cpu-features.h @@ -191,6 +191,9 @@ # ifndef cpu_has_64bit_addresses # define cpu_has_64bit_addresses 0 # endif +# ifndef cpu_vmbits +# define cpu_vmbits 31 +# endif #endif #ifdef CONFIG_64BIT @@ -209,6 +212,10 @@ # ifndef cpu_has_64bit_addresses # define cpu_has_64bit_addresses 1 # endif +# ifndef cpu_vmbits +# define cpu_vmbits cpu_data[0].vmbits +# define __NEED_VMBITS_PROBE +# endif #endif #if defined(CONFIG_CPU_MIPSR2_IRQ_VI) && !defined(cpu_has_vint) diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h index 126044308dec..b39def3f6e03 100644 --- a/arch/mips/include/asm/cpu-info.h +++ b/arch/mips/include/asm/cpu-info.h @@ -58,6 +58,9 @@ struct cpuinfo_mips { struct cache_desc tcache; /* Tertiary/split secondary cache */ int srsets; /* Shadow register sets */ int core; /* physical core number */ +#ifdef CONFIG_64BIT + int vmbits; /* Virtual memory size in bits */ +#endif #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC) /* * In the MIPS MT "SMTC" model, each TC is considered diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 9cd508993956..8eda30b467da 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -110,7 +110,9 @@ #define VMALLOC_START MAP_BASE #define VMALLOC_END \ (VMALLOC_START + \ - PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE - (1UL << 32)) + min(PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \ + (1UL << cpu_vmbits)) - (1UL << 32)) + #if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \ VMALLOC_START != CKSSEG /* Load modules into 32bit-compatible segment. */ diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index 80e202eca056..9c187a64649b 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -284,6 +284,15 @@ static inline int __cpu_has_fpu(void) return ((cpu_get_fpu_id() & 0xff00) != FPIR_IMP_NONE); } +static inline void cpu_probe_vmbits(struct cpuinfo_mips *c) +{ +#ifdef __NEED_VMBITS_PROBE + write_c0_entryhi(0x3ffffffffffff000ULL); + back_to_back_c0_hazard(); + c->vmbits = fls64(read_c0_entryhi() & 0x3ffffffffffff000ULL); +#endif +} + #define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \ | MIPS_CPU_COUNTER) @@ -969,6 +978,8 @@ __cpuinit void cpu_probe(void) c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1; else c->srsets = 1; + + cpu_probe_vmbits(c); } __cpuinit void cpu_report(void) -- cgit v1.2.3