[POWERPC] Port fixmap from x86 and use for kmap_atomic

The fixmap code from x86 allows us to have compile time virtual addresses
that we change the physical addresses of at run time.

This is useful for applications like kmap_atomic, PCI config that is done
via direct memory map, kexec/kdump.

We got ride of CONFIG_HIGHMEM_START as we can now determine a more optimal
location for PKMAP_BASE based on where the fixmap addresses start and
working back from there.

Additionally, the kmap code in asm-powerpc/highmem.h always had debug
enabled.  Moved to using CONFIG_DEBUG_HIGHMEM to determine if we should
have the extra debug checking.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 26 insertions, 6 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 0062e6b1c555..5ccb579b81e4 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -45,6 +45,7 @@
 #include <asm/tlb.h>
 #include <asm/sections.h>
 #include <asm/vdso.h>
+#include <asm/fixmap.h>
 
 #include "mmu_decl.h"
 
@@ -57,6 +58,20 @@ int init_bootmem_done;
 int mem_init_done;
 unsigned long memory_limit;
 
+#ifdef CONFIG_HIGHMEM
+pte_t *kmap_pte;
+pgprot_t kmap_prot;
+
+EXPORT_SYMBOL(kmap_prot);
+EXPORT_SYMBOL(kmap_pte);
+
+static inline pte_t *virt_to_kpte(unsigned long vaddr)
+{
+        return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
+                        vaddr), vaddr), vaddr);
+}
+#endif
+
 int page_is_ram(unsigned long pfn)
 {
         unsigned long paddr = (pfn << PAGE_SHIFT);
@@ -311,14 +326,19 @@ void __init paging_init(void)
         unsigned long top_of_ram = lmb_end_of_DRAM();
         unsigned long max_zone_pfns[MAX_NR_ZONES];
 
+#ifdef CONFIG_PPC32
+        unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
+        unsigned long end = __fix_to_virt(FIX_HOLE);
+
+        for (; v < end; v += PAGE_SIZE)
+                map_page(v, 0, 0); /* XXX gross */
+#endif
+
 #ifdef CONFIG_HIGHMEM
         map_page(PKMAP_BASE, 0, 0);     /* XXX gross */
-        pkmap_page_table = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k
-                        (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
-        map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */
-        kmap_pte = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k
-                        (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN),
-                         KMAP_FIX_BEGIN);
+        pkmap_page_table = virt_to_kpte(PKMAP_BASE);
+
+        kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
         kmap_prot = PAGE_KERNEL;
 #endif /* CONFIG_HIGHMEM */