patch-2.4.20 linux-2.4.20/arch/mips/sibyte/sb1250/prom.c

• Lines: 120
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/mips/sibyte/sb1250/prom.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/mips/sibyte/sb1250/prom.c linux-2.4.20/arch/mips/sibyte/sb1250/prom.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) 2000, 2001 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/blk.h>
+#include <linux/bootmem.h>
+#include <linux/smp.h>
+
+#include <asm/bootinfo.h>
+#include <asm/reboot.h>
+
+extern char arcs_cmdline[];
+
+#ifdef CONFIG_EMBEDDED_RAMDISK
+/* These are symbols defined by the ramdisk linker script */
+extern unsigned char __rd_start;
+extern unsigned char __rd_end;
+#endif
+
+#define MAX_RAM_SIZE ((CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - 1)
+
+static __init void prom_meminit(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+	unsigned long initrd_pstart;
+	unsigned long initrd_pend;
+
+#ifdef CONFIG_EMBEDDED_RAMDISK
+	/* If we're using an embedded ramdisk, then __rd_start and __rd_end
+	   are defined by the linker to be on either side of the ramdisk
+	   area.  Otherwise, initrd_start should be defined by kernel command
+	   line arguments */
+	if (initrd_start == 0) {
+		initrd_start = (unsigned long)&__rd_start;
+		initrd_end = (unsigned long)&__rd_end;
+	}
+#endif
+
+	initrd_pstart = __pa(initrd_start);
+	initrd_pend = __pa(initrd_end);
+	if (initrd_start &&
+	    ((initrd_pstart > MAX_RAM_SIZE)
+	     || (initrd_pend > MAX_RAM_SIZE))) {
+		panic("initrd out of addressable memory");
+	}
+
+	add_memory_region(0, initrd_pstart,
+			  BOOT_MEM_RAM);
+	add_memory_region(initrd_pstart, initrd_pend - initrd_pstart,
+			  BOOT_MEM_RESERVED);
+	add_memory_region(initrd_pend,
+			  (CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024) - initrd_pend,
+			  BOOT_MEM_RAM);
+#else
+	add_memory_region(0, CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024,
+			  BOOT_MEM_RAM);
+#endif
+}
+
+void prom_cpu0_exit(void *unused)
+{
+        while (1) ;
+}
+
+static void prom_linux_exit(void)
+{
+#ifdef CONFIG_SMP
+	if (smp_processor_id()) {
+		smp_call_function(prom_cpu0_exit,NULL,1,1);
+	}
+#endif
+	while(1);
+}
+
+/*
+ * prom_init is called just after the cpu type is determined, from init_arch()
+ */
+__init int prom_init(int argc, char **argv, char **envp, int *prom_vec)
+{
+	_machine_restart   = (void (*)(char *))prom_linux_exit;
+	_machine_halt      = prom_linux_exit;
+	_machine_power_off = prom_linux_exit;
+
+	strcpy(arcs_cmdline, "root=/dev/ram0 ");
+
+	mips_machgroup = MACH_GROUP_SIBYTE;
+	prom_meminit();
+
+	return 0;
+}
+
+void prom_free_prom_memory(void)
+{
+	/* Not sure what I'm supposed to do here.  Nothing, I think */
+}
+
+int page_is_ram(unsigned long pagenr)
+{
+	phys_t addr = pagenr << PAGE_SHIFT;
+	return (addr < (CONFIG_SIBYTE_STANDALONE_RAM_SIZE * 1024 * 1024));
+}