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authorGraf Yang <graf.yang@analog.com>2008-11-18 17:48:22 +0800
committerBryan Wu <cooloney@kernel.org>2008-11-18 17:48:22 +0800
commit8f65873e47784a390949f0d61e5692dbf2a8253e (patch)
tree4d9509bf5e52ebac190d79de04b783829d44f49e /arch/blackfin/mm/init.c
parentb8a989893cbdeb6c97a7b5af5f38fb0e480235f9 (diff)
downloadlinux-linaro-android-8f65873e47784a390949f0d61e5692dbf2a8253e.tar.gz
Blackfin arch: SMP supporting patchset: Blackfin kernel and memory management code
Blackfin dual core BF561 processor can support SMP like features. https://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:smp-like In this patch, we provide SMP extend to Blackfin kernel and memory management code Singed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
Diffstat (limited to 'arch/blackfin/mm/init.c')
-rw-r--r--arch/blackfin/mm/init.c60
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);