[POWERPC] 85xx: Add support for relocatable kernel (and booting at non-zero)

[linux-2.6-omap-h63xx.git] / arch / powerpc / mm / init_32.c

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index e1f5ded851f6ed08c40ff892af4423d7af4b7fa2..578750e4ca88bb24f30b6accd28b7fb1cba4f60b 100644 (file)
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -30,6 +30,7 @@
 #include <linux/highmem.h>
 #include <linux/initrd.h>
 #include <linux/pagemap.h>
+#include <linux/lmb.h>
 
 #include <asm/pgalloc.h>
 #include <asm/prom.h>
@@ -41,8 +42,6 @@
 #include <asm/machdep.h>
 #include <asm/btext.h>
 #include <asm/tlb.h>
-#include <asm/prom.h>
-#include <asm/lmb.h>
 #include <asm/sections.h>
 
 #include "mmu_decl.h"
@@ -60,8 +59,11 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 unsigned long total_memory;
 unsigned long total_lowmem;
 
-unsigned long ppc_memstart;
-unsigned long ppc_memoffset = PAGE_OFFSET;
+phys_addr_t memstart_addr = (phys_addr_t)~0ull;
+EXPORT_SYMBOL(memstart_addr);
+phys_addr_t kernstart_addr;
+EXPORT_SYMBOL(kernstart_addr);
+phys_addr_t lowmem_end_addr;
 
 int boot_mapsize;
 #ifdef CONFIG_PPC_PMAC
@@ -96,10 +98,10 @@ int __map_without_ltlbs;
 unsigned long __max_low_memory = MAX_LOW_MEM;
 
 /*
- * limit of what is accessible with initial MMU setup -
+ * address of the limit of what is accessible with initial MMU setup -
  * 256MB usually, but only 16MB on 601.
  */
-unsigned long __initial_memory_limit = 0x10000000;
+phys_addr_t __initial_memory_limit_addr = (phys_addr_t)0x10000000;
 
 /*
  * Check for command-line options that affect what MMU_init will do.
@@ -132,7 +134,10 @@ void __init MMU_init(void)
 
        /* 601 can only access 16MB at the moment */
        if (PVR_VER(mfspr(SPRN_PVR)) == 1)
-               __initial_memory_limit = 0x01000000;
+               __initial_memory_limit_addr = 0x01000000;
+       /* 8xx can only access 8MB at the moment */
+       if (PVR_VER(mfspr(SPRN_PVR)) == 0x50)
+               __initial_memory_limit_addr = 0x00800000;
 
        /* parse args from command line */
        MMU_setup();
@@ -143,8 +148,8 @@ void __init MMU_init(void)
                printk(KERN_WARNING "Only using first contiguous memory region");
        }
 
-       total_memory = lmb_end_of_DRAM();
-       total_lowmem = total_memory;
+       total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
+       lowmem_end_addr = memstart_addr + total_lowmem;
 
 #ifdef CONFIG_FSL_BOOKE
        /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
@@ -155,9 +160,10 @@ void __init MMU_init(void)
 
        if (total_lowmem > __max_low_memory) {
                total_lowmem = __max_low_memory;
+               lowmem_end_addr = memstart_addr + total_lowmem;
 #ifndef CONFIG_HIGHMEM
                total_memory = total_lowmem;
-               lmb_enforce_memory_limit(total_lowmem);
+               lmb_enforce_memory_limit(lowmem_end_addr);
                lmb_analyze();
 #endif /* CONFIG_HIGHMEM */
        }
@@ -182,8 +188,6 @@ void __init MMU_init(void)
        /* Map in I/O resources */
        if (ppc_md.progress)
                ppc_md.progress("MMU:setio", 0x302);
-       if (ppc_md.setup_io_mappings)
-               ppc_md.setup_io_mappings();
 
        /* Initialize the context management stuff */
        mmu_context_init();
@@ -206,7 +210,7 @@ void __init *early_get_page(void)
                p = alloc_bootmem_pages(PAGE_SIZE);
        } else {
                p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
-                                       __initial_memory_limit));
+                                       __initial_memory_limit_addr));
        }
        return p;
 }
@@ -256,3 +260,40 @@ void free_initrd_mem(unsigned long start, unsigned long end)
        }
 }
 #endif
+
+#ifdef CONFIG_PROC_KCORE
+static struct kcore_list kcore_vmem;
+
+static int __init setup_kcore(void)
+{
+       int i;
+
+       for (i = 0; i < lmb.memory.cnt; i++) {
+               unsigned long base;
+               unsigned long size;
+               struct kcore_list *kcore_mem;
+
+               base = lmb.memory.region[i].base;
+               size = lmb.memory.region[i].size;
+
+               kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
+               if (!kcore_mem)
+                       panic("%s: kmalloc failed\n", __func__);
+
+               /* must stay under 32 bits */
+               if ( 0xfffffffful - (unsigned long)__va(base) < size) {
+                       size = 0xfffffffful - (unsigned long)(__va(base));
+                       printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n",
+                                               size);
+               }
+
+               kclist_add(kcore_mem, __va(base), size);
+       }
+
+       kclist_add(&kcore_vmem, (void *)VMALLOC_START,
+               VMALLOC_END-VMALLOC_START);
+
+       return 0;
+}
+module_init(setup_kcore);
+#endif