diff options
Diffstat (limited to 'arch/metag/kernel/setup.c')
| -rw-r--r-- | arch/metag/kernel/setup.c | 45 |
1 files changed, 40 insertions, 5 deletions
diff --git a/arch/metag/kernel/setup.c b/arch/metag/kernel/setup.c index dcb1d6d51ce4..9803ca4f6510 100644 --- a/arch/metag/kernel/setup.c +++ b/arch/metag/kernel/setup.c @@ -35,6 +35,7 @@ #include <asm/hwthread.h> #include <asm/l2cache.h> #include <asm/mach/arch.h> +#include <asm/metag_mem.h> #include <asm/metag_regs.h> #include <asm/mmu.h> #include <asm/mmzone.h> @@ -75,6 +76,32 @@ META2_PRIV | \ UNALIGNED_PRIV) +/* + * Protect access to: + * 0x06000000-0x07ffffff Direct mapped region + * 0x05000000-0x05ffffff MMU table region (Meta1) + * 0x04400000-0x047fffff Cache flush region + * 0x84000000-0x87ffffff Core cache memory region (Meta2) + * + * Allow access to: + * 0x80000000-0x81ffffff Core code memory region (Meta2) + */ +#ifdef CONFIG_METAG_META12 +#define PRIVSYSR_BITS TXPRIVSYSR_ALL_BITS +#else +#define PRIVSYSR_BITS (TXPRIVSYSR_ALL_BITS & ~TXPRIVSYSR_CORECODE_BIT) +#endif + +/* Protect all 0x02xxxxxx and 0x048xxxxx. */ +#define PIOREG_BITS 0xffffffff + +/* + * Protect all 0x04000xx0 (system events) + * except write combiner flush and write fence (system events 4 and 5). + */ +#define PSYREG_BITS 0xfffffffb + + extern char _heap_start[]; #ifdef CONFIG_METAG_BUILTIN_DTB @@ -371,7 +398,7 @@ void __init setup_arch(char **cmdline_p) paging_init(heap_end); - setup_txprivext(); + setup_priv(); /* Setup the boot cpu's mapping. The rest will be setup below. */ cpu_2_hwthread_id[smp_processor_id()] = hard_processor_id(); @@ -531,13 +558,21 @@ void __init metag_start_kernel(char *args) start_kernel(); } -/* - * Setup TXPRIVEXT register to be prevent userland from touching our - * precious registers. +/** + * setup_priv() - Set up privilege protection registers. + * + * Set up privilege protection registers such as TXPRIVEXT to prevent userland + * from touching our precious registers and sensitive memory areas. */ -void setup_txprivext(void) +void setup_priv(void) { + unsigned int offset = hard_processor_id() << TXPRIVREG_STRIDE_S; + __core_reg_set(TXPRIVEXT, PRIV_BITS); + + metag_out32(PRIVSYSR_BITS, T0PRIVSYSR + offset); + metag_out32(PIOREG_BITS, T0PIOREG + offset); + metag_out32(PSYREG_BITS, T0PSYREG + offset); } PTBI pTBI_get(unsigned int cpu) |