diff options
| -rw-r--r-- | arch/arc/include/asm/setup.h | 1 | ||||
| -rw-r--r-- | arch/arc/mm/cache.c | 12 | ||||
| -rw-r--r-- | arch/arc/mm/init.c | 5 |
3 files changed, 16 insertions, 2 deletions
diff --git a/arch/arc/include/asm/setup.h b/arch/arc/include/asm/setup.h index cb954cdab070..c568a9df82b1 100644 --- a/arch/arc/include/asm/setup.h +++ b/arch/arc/include/asm/setup.h @@ -31,6 +31,7 @@ extern int root_mountflags, end_mem; void setup_processor(void); void __init setup_arch_memory(void); +long __init arc_get_mem_sz(void); /* Helpers used in arc_*_mumbojumbo routines */ #define IS_AVAIL1(v, s) ((v) ? s : "") diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c index 1b4cda10844a..3c275a81528c 100644 --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -995,6 +995,8 @@ SYSCALL_DEFINE3(cacheflush, uint32_t, start, uint32_t, sz, uint32_t, flags) */ noinline void arc_ioc_setup(void) { + unsigned int ap_sz; + /* Flush + invalidate + disable L1 dcache */ __dc_disable(); @@ -1005,8 +1007,14 @@ noinline void arc_ioc_setup(void) /* IOC Aperture start: TDB: handle non default CONFIG_LINUX_LINK_BASE */ write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000); - /* IOC Aperture size: TBD: handle different mem sizes, PAE... */ - write_aux_reg(ARC_REG_IO_COH_AP0_SIZE, 0x11); + /* + * IOC Aperture size: + * decoded as 2 ^ (SIZE + 2) KB: so setting 0x11 implies 512M + * TBD: fix for PGU + 1GB of low mem + * TBD: fix for PAE + */ + ap_sz = order_base_2(arc_get_mem_sz()/1024) - 2; + write_aux_reg(ARC_REG_IO_COH_AP0_SIZE, ap_sz); write_aux_reg(ARC_REG_IO_COH_PARTIAL, 1); write_aux_reg(ARC_REG_IO_COH_ENABLE, 1); diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index 399e2f223d25..8c9415ed6280 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -40,6 +40,11 @@ struct pglist_data node_data[MAX_NUMNODES] __read_mostly; EXPORT_SYMBOL(node_data); #endif +long __init arc_get_mem_sz(void) +{ + return low_mem_sz; +} + /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ static int __init setup_mem_sz(char *str) { |