patch-2.1.29 linux/arch/sparc64/prom/memory.c

• Lines: 153
• Date: Wed Mar 5 17:04:31 1997
• Orig file: v2.1.28/linux/arch/sparc64/prom/memory.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.28/linux/arch/sparc64/prom/memory.c linux/arch/sparc64/prom/memory.c
@@ -0,0 +1,152 @@
+/* $Id: memory.c,v 1.3 1997/03/04 16:27:10 jj 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 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+#include <asm/openprom.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_prom64_registers prom_reg_memlist[64];
+struct linux_prom64_registers prom_reg_tmp[64];
+
+struct linux_mlist_p1275 prom_phys_total[64];
+struct linux_mlist_p1275 prom_prom_taken[64];
+struct linux_mlist_p1275 prom_phys_avail[64];
+
+struct linux_mlist_p1275 *prom_ptot_ptr = prom_phys_total;
+struct linux_mlist_p1275 *prom_ptak_ptr = prom_prom_taken;
+struct linux_mlist_p1275 *prom_pavl_ptr = prom_phys_avail;
+
+struct linux_mem_p1275 prom_memlist;
+
+
+/* Internal Prom library routine to sort a linux_mlist_p1275 memory
+ * list.  Used below in initialization.
+ */
+__initfunc(static void
+prom_sortmemlist(struct linux_mlist_p1275 *thislist))
+{
+	int swapi = 0;
+	int i, mitr, tmpsize;
+	unsigned long tmpaddr;
+	unsigned long 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;
+	}
+}
+
+/* Initialize the memory lists based upon the prom version. */
+__initfunc(void prom_meminit(void))
+{
+	int node = 0;
+	unsigned int iter, num_regs;
+
+	node = prom_finddevice("/memory");
+	num_regs = prom_getproperty(node, "available",
+				    (char *) prom_reg_memlist,
+				    sizeof(prom_reg_memlist));
+	num_regs = (num_regs/sizeof(struct linux_prom64_registers));
+	for(iter=0; iter<num_regs; iter++) {
+		prom_phys_avail[iter].start_adr =
+			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_prom64_registers));
+	for(iter=0; iter<num_regs; iter++) {
+		prom_phys_total[iter].start_adr =
+			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_finddevice("/virtual-memory");
+	num_regs = prom_getproperty(node, "available",
+				    (char *) prom_reg_memlist,
+				    sizeof(prom_reg_memlist));
+	num_regs = (num_regs/sizeof(struct linux_prom64_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 =
+			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_phys_total[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 =
+		((unsigned long)-1) - (unsigned long) prom_prom_taken[iter-1].start_adr;
+
+	/* Sort the other two lists. */
+	prom_sortmemlist(prom_phys_total);
+	prom_sortmemlist(prom_phys_avail);
+
+	/* Link all the lists into the top-level descriptor. */
+	prom_memlist.p1275_totphys=&prom_ptot_ptr;
+	prom_memlist.p1275_prommap=&prom_ptak_ptr;
+	prom_memlist.p1275_available=&prom_pavl_ptr;
+}
+
+/* This returns a pointer to our libraries internal p1275 format
+ * memory descriptor.
+ */
+struct linux_mem_p1275 *
+prom_meminfo(void)
+{
+	return &prom_memlist;
+}