[POWERPC] Remove and replace uses of PPC_MEMSTART with memstart_addr
A number of users of PPC_MEMSTART (40x, ppc_mmu_32) can just always use 0 as we don't support booting these kernels at non-zero physical addresses since their exception vectors must be at 0 (or 0xfffx_xxxx). For the sub-arches that support relocatable interrupt vectors (book-e), it's reasonable to have memory start at a non-zero physical address. For those cases use the variable memstart_addr instead of the #define PPC_MEMSTART since the only uses of PPC_MEMSTART are for initialization and in the future we can set memstart_addr at runtime to have a relocatable kernel. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -97,7 +97,7 @@ unsigned long __init mmu_mapin_ram(void)
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phys_addr_t p;
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v = KERNELBASE;
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p = PPC_MEMSTART;
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p = 0;
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s = total_lowmem;
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if (__map_without_ltlbs)
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@ -53,13 +53,12 @@
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#include <asm/machdep.h>
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#include <asm/setup.h>
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#include "mmu_decl.h"
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extern void loadcam_entry(unsigned int index);
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unsigned int tlbcam_index;
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unsigned int num_tlbcam_entries;
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static unsigned long __cam0, __cam1, __cam2;
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extern unsigned long total_lowmem;
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extern unsigned long __max_low_memory;
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extern unsigned long __initial_memory_limit;
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#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
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#define NUM_TLBCAMS (16)
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@ -165,15 +164,15 @@ void invalidate_tlbcam_entry(int index)
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void __init cam_mapin_ram(unsigned long cam0, unsigned long cam1,
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unsigned long cam2)
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{
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settlbcam(0, PAGE_OFFSET, PPC_MEMSTART, cam0, _PAGE_KERNEL, 0);
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settlbcam(0, PAGE_OFFSET, memstart_addr, cam0, _PAGE_KERNEL, 0);
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tlbcam_index++;
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if (cam1) {
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tlbcam_index++;
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settlbcam(1, PAGE_OFFSET+cam0, PPC_MEMSTART+cam0, cam1, _PAGE_KERNEL, 0);
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settlbcam(1, PAGE_OFFSET+cam0, memstart_addr+cam0, cam1, _PAGE_KERNEL, 0);
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}
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if (cam2) {
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tlbcam_index++;
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settlbcam(2, PAGE_OFFSET+cam0+cam1, PPC_MEMSTART+cam0+cam1, cam2, _PAGE_KERNEL, 0);
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settlbcam(2, PAGE_OFFSET+cam0+cam1, memstart_addr+cam0+cam1, cam2, _PAGE_KERNEL, 0);
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}
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}
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@ -59,8 +59,8 @@ DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long total_memory;
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unsigned long total_lowmem;
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unsigned long ppc_memstart;
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unsigned long ppc_memoffset = PAGE_OFFSET;
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phys_addr_t memstart_addr;
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phys_addr_t lowmem_end_addr;
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int boot_mapsize;
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#ifdef CONFIG_PPC_PMAC
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@ -145,8 +145,7 @@ void __init MMU_init(void)
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printk(KERN_WARNING "Only using first contiguous memory region");
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}
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total_memory = lmb_end_of_DRAM();
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total_lowmem = total_memory;
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total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr;
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#ifdef CONFIG_FSL_BOOKE
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/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
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@ -51,6 +51,7 @@ extern unsigned long __max_low_memory;
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extern unsigned long __initial_memory_limit;
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extern unsigned long total_memory;
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extern unsigned long total_lowmem;
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extern phys_addr_t memstart_addr;
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/* ...and now those things that may be slightly different between processor
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* architectures. -- Dan
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@ -281,12 +281,13 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
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*/
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void __init mapin_ram(void)
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{
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unsigned long v, p, s, f;
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unsigned long v, s, f;
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phys_addr_t p;
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int ktext;
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s = mmu_mapin_ram();
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v = KERNELBASE + s;
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p = PPC_MEMSTART + s;
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p = memstart_addr + s;
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for (; s < total_lowmem; s += PAGE_SIZE) {
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ktext = ((char *) v >= _stext && (char *) v < etext);
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f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM;
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@ -82,7 +82,6 @@ unsigned long __init mmu_mapin_ram(void)
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#else
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unsigned long tot, bl, done;
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unsigned long max_size = (256<<20);
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unsigned long align;
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if (__map_without_bats) {
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printk(KERN_DEBUG "RAM mapped without BATs\n");
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@ -93,19 +92,13 @@ unsigned long __init mmu_mapin_ram(void)
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/* Make sure we don't map a block larger than the
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smallest alignment of the physical address. */
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/* alignment of PPC_MEMSTART */
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align = ~(PPC_MEMSTART-1) & PPC_MEMSTART;
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/* set BAT block size to MIN(max_size, align) */
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if (align && align < max_size)
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max_size = align;
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tot = total_lowmem;
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for (bl = 128<<10; bl < max_size; bl <<= 1) {
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if (bl * 2 > tot)
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break;
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}
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setbat(2, KERNELBASE, PPC_MEMSTART, bl, _PAGE_RAM);
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setbat(2, KERNELBASE, 0, bl, _PAGE_RAM);
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done = (unsigned long)bat_addrs[2].limit - KERNELBASE + 1;
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if ((done < tot) && !bat_addrs[3].limit) {
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/* use BAT3 to cover a bit more */
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@ -113,7 +106,7 @@ unsigned long __init mmu_mapin_ram(void)
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for (bl = 128<<10; bl < max_size; bl <<= 1)
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if (bl * 2 > tot)
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break;
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setbat(3, KERNELBASE+done, PPC_MEMSTART+done, bl, _PAGE_RAM);
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setbat(3, KERNELBASE+done, done, bl, _PAGE_RAM);
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done = (unsigned long)bat_addrs[3].limit - KERNELBASE + 1;
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}
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@ -3,8 +3,6 @@
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#define VM_DATA_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS32
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#define PPC_MEMSTART 0
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#ifdef CONFIG_NOT_COHERENT_CACHE
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#define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES
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#endif
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