sparc32: More memory probing consolidation.

The PROM library function prom_meminit() builds a table,
prom_phys_avail[], just so that probe_memory() in
arch/sparc/mm/fault.c can copy it into sp_banks[].

Just have prom_meminit() fill in the sp_banks[] array directly, and
remove duplicated sort() function.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 69 insertions, 141 deletions

diff --git a/arch/sparc/kernel/setup.c b/arch/sparc/kernel/setup.c
index 3c13137685da..8a55c4f0df84 100644
--- a/arch/sparc/kernel/setup.c
+++ b/arch/sparc/kernel/setup.c
@@ -180,11 +180,9 @@ static void __init boot_flags_init(char *commands)
 
 /* This routine will in the future do all the nasty prom stuff
  * to probe for the mmu type and its parameters, etc. This will
- * also be where SMP things happen plus the Sparc specific memory
- * physical memory probe as on the alpha.
+ * also be where SMP things happen.
  */
 
-extern int prom_probe_memory(void);
 extern void sun4c_probe_vac(void);
 extern char cputypval;
 extern unsigned long start, end;
@@ -268,7 +266,6 @@ void __init setup_arch(char **cmdline_p)
         if (ARCH_SUN4C_SUN4)
                 sun4c_probe_vac();
         load_mmu();
-        (void) prom_probe_memory();
 
         phys_base = 0xffffffffUL;
         highest_paddr = 0UL;
diff --git a/arch/sparc/mm/fault.c b/arch/sparc/mm/fault.c
index f25876a56fe6..abd50795a7b6 100644
--- a/arch/sparc/mm/fault.c
+++ b/arch/sparc/mm/fault.c
@@ -47,64 +47,15 @@ int vac_size, vac_linesize, vac_do_hw_vac_flushes;
 int vac_entries_per_context, vac_entries_per_segment;
 int vac_entries_per_page;
 
-/* Nice, simple, prom library does all the sweating for us. ;) */
-int prom_probe_memory (void)
+/* Return how much physical memory we have.  */
+unsigned long probe_memory(void)
 {
-        register struct linux_mlist_v0 *mlist;
-        register unsigned long bytes, base_paddr, tally;
-        register int i;
-
-        i = 0;
-        mlist= prom_meminfo();
-        bytes = tally = mlist->num_bytes;
-        base_paddr = (unsigned long) mlist->start_adr;
-  
-        sp_banks[0].base_addr = base_paddr;
-        sp_banks[0].num_bytes = bytes;
-
-        while (mlist->theres_more != (void *) 0){
-                i++;
-                mlist = mlist->theres_more;
-                bytes = mlist->num_bytes;
-                tally += bytes;
-                if (i > SPARC_PHYS_BANKS-1) {
-                        printk ("The machine has more banks than "
-                                "this kernel can support\n"
-                                "Increase the SPARC_PHYS_BANKS "
-                                "setting (currently %d)\n",
-                                SPARC_PHYS_BANKS);
-                        i = SPARC_PHYS_BANKS-1;
-                        break;
-                }
-    
-                sp_banks[i].base_addr = (unsigned long) mlist->start_adr;
-                sp_banks[i].num_bytes = mlist->num_bytes;
-        }
-
-        i++;
-        sp_banks[i].base_addr = 0xdeadbeef;
-        sp_banks[i].num_bytes = 0;
-
-        /* Now mask all bank sizes on a page boundary, it is all we can
-         * use anyways.
-         */
-        for(i=0; sp_banks[i].num_bytes != 0; i++)
-                sp_banks[i].num_bytes &= PAGE_MASK;
-
-        return tally;
-}
-
-/* Traverse the memory lists in the prom to see how much physical we
- * have.
- */
-unsigned long
-probe_memory(void)
-{
-        int total;
+        unsigned long total = 0;
+        int i;
 
-        total = prom_probe_memory();
+        for (i = 0; sp_banks[i].num_bytes; i++)
+                total += sp_banks[i].num_bytes;
 
-        /* Oh man, much nicer, keep the dirt in promlib. */
         return total;
 }
 
diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c
index 08ac1bf2e588..947f047dc95a 100644
--- a/arch/sparc/prom/memory.c
+++ b/arch/sparc/prom/memory.c
@@ -1,120 +1,100 @@
 /* memory.c: Prom routine for acquiring various bits of information
  *           about RAM on the machine, both virtual and physical.
  *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
  * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
  */
 
 #include <linux/kernel.h>
+#include <linux/sort.h>
 #include <linux/init.h>
 
 #include <asm/openprom.h>
 #include <asm/sun4prom.h>
 #include <asm/oplib.h>
+#include <asm/page.h>
 
-/* This routine, for consistency, returns the ram parameters in the
- * V0 prom memory descriptor format.  I choose this format because I
- * think it was the easiest to work with.  I feel the religious
- * arguments now... ;)  Also, I return the linked lists sorted to
- * prevent paging_init() upset stomach as I have not yet written
- * the pepto-bismol kernel module yet.
- */
+static int __init prom_meminit_v0(void)
+{
+        struct linux_mlist_v0 *p;
+        int index;
 
-struct linux_prom_registers prom_reg_memlist[64];
+        index = 0;
+        for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
+                sp_banks[index].base_addr = (unsigned long) p->start_adr;
+                sp_banks[index].num_bytes = p->num_bytes;
+                index++;
+        }
 
-struct linux_mlist_v0 prom_phys_avail[64];
+        return index;
+}
 
-/* Internal Prom library routine to sort a linux_mlist_v0 memory
- * list.  Used below in initialization.
- */
-static void __init
-prom_sortmemlist(struct linux_mlist_v0 *thislist)
+static int __init prom_meminit_v2(void)
 {
-        int swapi = 0;
-        int i, mitr, tmpsize;
-        char *tmpaddr;
-        char *lowest;
-
-        for(i=0; thislist[i].theres_more; i++) {
-                lowest = thislist[i].start_adr;
-                for(mitr = i+1; thislist[mitr-1].theres_more; mitr++)
-                        if(thislist[mitr].start_adr < lowest) {
-                                lowest = thislist[mitr].start_adr;
-                                swapi = mitr;
-                        }
-                if(lowest == thislist[i].start_adr) continue;
-                tmpaddr = thislist[swapi].start_adr;
-                tmpsize = thislist[swapi].num_bytes;
-                for(mitr = swapi; mitr > i; mitr--) {
-                        thislist[mitr].start_adr = thislist[mitr-1].start_adr;
-                        thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
-                }
-                thislist[i].start_adr = tmpaddr;
-                thislist[i].num_bytes = tmpsize;
+        struct linux_prom_registers reg[64];
+        int node, size, num_ents, i;
+
+        node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
+        size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
+        num_ents = size / sizeof(struct linux_prom_registers);
+
+        for (i = 0; i < num_ents; i++) {
+                sp_banks[i].base_addr = reg[i].phys_addr;
+                sp_banks[i].num_bytes = reg[i].reg_size;
         }
 
-        return;
+        return num_ents;
+}
+
+static int __init prom_meminit_sun4(void)
+{
+#ifdef CONFIG_SUN4
+        sp_banks[0].base_addr = 0;
+        sp_banks[0].num_bytes = *(sun4_romvec->memoryavail);
+#endif
+        return 1;
+}
+
+static int sp_banks_cmp(const void *a, const void *b)
+{
+        const struct sparc_phys_banks *x = a, *y = b;
+
+        if (x->base_addr > y->base_addr)
+                return 1;
+        if (x->base_addr < y->base_addr)
+                return -1;
+        return 0;
 }
 
 /* Initialize the memory lists based upon the prom version. */
 void __init prom_meminit(void)
 {
-        int node = 0;
-        unsigned int iter, num_regs;
-        struct linux_mlist_v0 *mptr;  /* ptr for traversal */
+        int i, num_ents = 0;
 
-        switch(prom_vers) {
+        switch (prom_vers) {
         case PROM_V0:
-                /* Nice, kind of easier to do in this case. */
-                for(mptr = (*(romvec->pv_v0mem.v0_available)), iter=0;
-                    mptr; mptr=mptr->theres_more, iter++) {
-                        prom_phys_avail[iter].start_adr = mptr->start_adr;
-                        prom_phys_avail[iter].num_bytes = mptr->num_bytes;
-                        prom_phys_avail[iter].theres_more = &prom_phys_avail[iter+1];
-                }
-                prom_phys_avail[iter-1].theres_more = NULL;
-                prom_sortmemlist(prom_phys_avail);
+                num_ents = prom_meminit_v0();
                 break;
+
         case PROM_V2:
         case PROM_V3:
-                /* Grrr, have to traverse the prom device tree ;( */
-                node = prom_getchild(prom_root_node);
-                node = prom_searchsiblings(node, "memory");
-                num_regs = prom_getproperty(node, "available",
-                                            (char *) prom_reg_memlist,
-                                            sizeof(prom_reg_memlist));
-                num_regs = (num_regs/sizeof(struct linux_prom_registers));
-                for(iter=0; iter<num_regs; iter++) {
-                        prom_phys_avail[iter].start_adr =
-                                (char *) prom_reg_memlist[iter].phys_addr;
-                        prom_phys_avail[iter].num_bytes =
-                                (unsigned long) prom_reg_memlist[iter].reg_size;
-                        prom_phys_avail[iter].theres_more =
-                                &prom_phys_avail[iter+1];
-                }
-                prom_phys_avail[iter-1].theres_more = NULL;
-                prom_sortmemlist(prom_phys_avail);
+                num_ents = prom_meminit_v2();
                 break;
 
         case PROM_SUN4:
-#ifdef CONFIG_SUN4      
-                /* how simple :) */
-                prom_phys_avail[0].start_adr = NULL;
-                prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
-                prom_phys_avail[0].theres_more = NULL;
-#endif
+                num_ents = prom_meminit_sun4();
                 break;
 
         default:
                 break;
-        };
-}
+        }
+        sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
+             sp_banks_cmp, NULL);
 
-/* This returns a pointer to our libraries internal v0 format
- * available memory list.
- */
-struct linux_mlist_v0 *
-prom_meminfo(void)
-{
-        return prom_phys_avail;
+        /* Sentinel.  */
+        sp_banks[num_ents].base_addr = 0xdeadbeef;
+        sp_banks[num_ents].num_bytes = 0;
+
+        for (i = 0; i < num_ents; i++)
+                sp_banks[i].num_bytes &= PAGE_MASK;
 }