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authorDavid S. Miller <davem@davemloft.net>2008-05-01 22:28:17 -0700
committerDavid S. Miller <davem@davemloft.net>2008-05-02 05:22:53 -0700
commit9f2b2a5f68c27c00f1e1f1922de5aa2f24505ed8 (patch)
tree2afd44efe02154ab1bfcbd47e1d8ba55167da4e5 /arch/sparc/prom
parentsparc32: Kill totally unused memory information tables. (diff)
downloadlinux-dev-9f2b2a5f68c27c00f1e1f1922de5aa2f24505ed8.tar.xz
linux-dev-9f2b2a5f68c27c00f1e1f1922de5aa2f24505ed8.zip
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>
Diffstat (limited to '')
-rw-r--r--arch/sparc/prom/memory.c144
1 files changed, 62 insertions, 82 deletions
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;
}