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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc/prom/memory.c
downloadlinux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
linux-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sparc/prom/memory.c')
-rw-r--r--arch/sparc/prom/memory.c216
1 files changed, 216 insertions, 0 deletions
diff --git a/arch/sparc/prom/memory.c b/arch/sparc/prom/memory.c
new file mode 100644
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+++ b/arch/sparc/prom/memory.c
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+/* $Id: memory.c,v 1.15 2000/01/29 01:09:12 anton Exp $
+ * 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) 1997 Michael A. Griffith (grif@acm.org)
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/openprom.h>
+#include <asm/sun4prom.h>
+#include <asm/oplib.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.
+ */
+
+struct linux_prom_registers prom_reg_memlist[64];
+struct linux_prom_registers prom_reg_tmp[64];
+
+struct linux_mlist_v0 prom_phys_total[64];
+struct linux_mlist_v0 prom_prom_taken[64];
+struct linux_mlist_v0 prom_phys_avail[64];
+
+struct linux_mlist_v0 *prom_ptot_ptr = prom_phys_total;
+struct linux_mlist_v0 *prom_ptak_ptr = prom_prom_taken;
+struct linux_mlist_v0 *prom_pavl_ptr = prom_phys_avail;
+
+struct linux_mem_v0 prom_memlist;
+
+
+/* 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)
+{
+ int swapi = 0;
+ int i, mitr, tmpsize;
+ char *tmpaddr;
+ char *lowest;
+
+ for(i=0; thislist[i].theres_more != 0; i++) {
+ lowest = thislist[i].start_adr;
+ for(mitr = i+1; thislist[mitr-1].theres_more != 0; 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;
+ }
+
+ return;
+}
+
+/* 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 */
+
+ switch(prom_vers) {
+ case PROM_V0:
+ /* Nice, kind of easier to do in this case. */
+ /* First, the total physical descriptors. */
+ for(mptr = (*(romvec->pv_v0mem.v0_totphys)), iter=0;
+ mptr; mptr=mptr->theres_more, iter++) {
+ prom_phys_total[iter].start_adr = mptr->start_adr;
+ prom_phys_total[iter].num_bytes = mptr->num_bytes;
+ prom_phys_total[iter].theres_more = &prom_phys_total[iter+1];
+ }
+ prom_phys_total[iter-1].theres_more = 0x0;
+ /* Second, the total prom taken descriptors. */
+ for(mptr = (*(romvec->pv_v0mem.v0_prommap)), iter=0;
+ mptr; mptr=mptr->theres_more, iter++) {
+ prom_prom_taken[iter].start_adr = mptr->start_adr;
+ prom_prom_taken[iter].num_bytes = mptr->num_bytes;
+ prom_prom_taken[iter].theres_more = &prom_prom_taken[iter+1];
+ }
+ prom_prom_taken[iter-1].theres_more = 0x0;
+ /* Last, the available physical descriptors. */
+ 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 = 0x0;
+ /* Sort all the lists. */
+ prom_sortmemlist(prom_phys_total);
+ prom_sortmemlist(prom_prom_taken);
+ prom_sortmemlist(prom_phys_avail);
+ 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 = 0x0;
+
+ num_regs = prom_getproperty(node, "reg",
+ (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_total[iter].start_adr =
+ (char *) prom_reg_memlist[iter].phys_addr;
+ prom_phys_total[iter].num_bytes =
+ (unsigned long) prom_reg_memlist[iter].reg_size;
+ prom_phys_total[iter].theres_more =
+ &prom_phys_total[iter+1];
+ }
+ prom_phys_total[iter-1].theres_more = 0x0;
+
+ node = prom_getchild(prom_root_node);
+ node = prom_searchsiblings(node, "virtual-memory");
+ num_regs = prom_getproperty(node, "available",
+ (char *) prom_reg_memlist,
+ sizeof(prom_reg_memlist));
+ num_regs = (num_regs/sizeof(struct linux_prom_registers));
+
+ /* Convert available virtual areas to taken virtual
+ * areas. First sort, then convert.
+ */
+ for(iter=0; iter<num_regs; iter++) {
+ prom_prom_taken[iter].start_adr =
+ (char *) prom_reg_memlist[iter].phys_addr;
+ prom_prom_taken[iter].num_bytes =
+ (unsigned long) prom_reg_memlist[iter].reg_size;
+ prom_prom_taken[iter].theres_more =
+ &prom_prom_taken[iter+1];
+ }
+ prom_prom_taken[iter-1].theres_more = 0x0;
+
+ prom_sortmemlist(prom_prom_taken);
+
+ /* Finally, convert. */
+ for(iter=0; iter<num_regs; iter++) {
+ prom_prom_taken[iter].start_adr =
+ prom_prom_taken[iter].start_adr +
+ prom_prom_taken[iter].num_bytes;
+ prom_prom_taken[iter].num_bytes =
+ prom_prom_taken[iter+1].start_adr -
+ prom_prom_taken[iter].start_adr;
+ }
+ prom_prom_taken[iter-1].num_bytes =
+ 0xffffffff - (unsigned long) prom_prom_taken[iter-1].start_adr;
+
+ /* Sort the other two lists. */
+ prom_sortmemlist(prom_phys_total);
+ prom_sortmemlist(prom_phys_avail);
+ break;
+
+ case PROM_SUN4:
+#ifdef CONFIG_SUN4
+ /* how simple :) */
+ prom_phys_total[0].start_adr = 0x0;
+ prom_phys_total[0].num_bytes = *(sun4_romvec->memorysize);
+ prom_phys_total[0].theres_more = 0x0;
+ prom_prom_taken[0].start_adr = 0x0;
+ prom_prom_taken[0].num_bytes = 0x0;
+ prom_prom_taken[0].theres_more = 0x0;
+ prom_phys_avail[0].start_adr = 0x0;
+ prom_phys_avail[0].num_bytes = *(sun4_romvec->memoryavail);
+ prom_phys_avail[0].theres_more = 0x0;
+#endif
+ break;
+
+ default:
+ break;
+ };
+
+ /* Link all the lists into the top-level descriptor. */
+ prom_memlist.v0_totphys=&prom_ptot_ptr;
+ prom_memlist.v0_prommap=&prom_ptak_ptr;
+ prom_memlist.v0_available=&prom_pavl_ptr;
+
+ return;
+}
+
+/* This returns a pointer to our libraries internal v0 format
+ * memory descriptor.
+ */
+struct linux_mem_v0 *
+prom_meminfo(void)
+{
+ return &prom_memlist;
+}