diff options
Diffstat (limited to 'arch/blackfin/mm/init.c')
| -rw-r--r-- | arch/blackfin/mm/init.c | 60 |
1 files changed, 47 insertions, 13 deletions
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c index bc240abb874..57d306b9c56 100644 --- a/arch/blackfin/mm/init.c +++ b/arch/blackfin/mm/init.c @@ -31,7 +31,8 @@ #include <linux/bootmem.h> #include <linux/uaccess.h> #include <asm/bfin-global.h> -#include <asm/l1layout.h> +#include <asm/pda.h> +#include <asm/cplbinit.h> #include "blackfin_sram.h" /* @@ -53,6 +54,11 @@ static unsigned long empty_bad_page; unsigned long empty_zero_page; +extern unsigned long exception_stack[NR_CPUS][1024]; + +struct blackfin_pda cpu_pda[NR_CPUS]; +EXPORT_SYMBOL(cpu_pda); + /* * paging_init() continues the virtual memory environment setup which * was begun by the code in arch/head.S. @@ -98,6 +104,42 @@ void __init paging_init(void) } } +asmlinkage void init_pda(void) +{ + unsigned int cpu = raw_smp_processor_id(); + + /* Initialize the PDA fields holding references to other parts + of the memory. The content of such memory is still + undefined at the time of the call, we are only setting up + valid pointers to it. */ + memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu])); + + cpu_pda[0].next = &cpu_pda[1]; + cpu_pda[1].next = &cpu_pda[0]; + + cpu_pda[cpu].ex_stack = exception_stack[cpu + 1]; + +#ifdef CONFIG_MPU +#else + cpu_pda[cpu].ipdt = ipdt_tables[cpu]; + cpu_pda[cpu].dpdt = dpdt_tables[cpu]; +#ifdef CONFIG_CPLB_INFO + cpu_pda[cpu].ipdt_swapcount = ipdt_swapcount_tables[cpu]; + cpu_pda[cpu].dpdt_swapcount = dpdt_swapcount_tables[cpu]; +#endif +#endif + +#ifdef CONFIG_SMP + cpu_pda[cpu].imask = 0x1f; +#endif +} + +void __cpuinit reserve_pda(void) +{ + printk(KERN_INFO "PDA for CPU%u reserved at %p\n", smp_processor_id(), + &cpu_pda[smp_processor_id()]); +} + void __init mem_init(void) { unsigned int codek = 0, datak = 0, initk = 0; @@ -141,21 +183,13 @@ void __init mem_init(void) static int __init sram_init(void) { - unsigned long tmp; - /* Initialize the blackfin L1 Memory. */ bfin_sram_init(); - /* Allocate this once; never free it. We assume this gives us a - pointer to the start of L1 scratchpad memory; panic if it - doesn't. */ - tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info)); - if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) { - printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n", - tmp, (unsigned long)L1_SCRATCH_TASK_INFO); - panic("No L1, time to give up\n"); - } - + /* Reserve the PDA space for the boot CPU right after we + * initialized the scratch memory allocator. + */ + reserve_pda(); return 0; } pure_initcall(sram_init); |