patch-2.4.19 linux-2.4.19/arch/mips64/kernel/setup.c

• Lines: 787
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/mips64/kernel/setup.c
• Orig date: Sun Sep 9 10:43:01 2001

diff -urN linux-2.4.18/arch/mips64/kernel/setup.c linux-2.4.19/arch/mips64/kernel/setup.c
@@ -4,9 +4,11 @@
  * for more details.
  *
  * Copyright (C) 1995 Linus Torvalds
- * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Ralf Baechle
+ * Copyright (C) 1995 Waldorf Electronics
+ * Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 Ralf Baechle
  * Copyright (C) 1996 Stoned Elipot
  * Copyright (C) 1999 Silicon Graphics, Inc.
+ * Copyright (C) 2002  Maciej W. Rozycki
  */
 #include <linux/config.h>
 #include <linux/errno.h>
@@ -14,6 +16,7 @@
 #include <linux/sched.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/module.h>
 #include <linux/stddef.h>
 #include <linux/string.h>
 #include <linux/unistd.h>
@@ -23,14 +26,15 @@
 #include <linux/utsname.h>
 #include <linux/a.out.h>
 #include <linux/tty.h>
+#include <linux/bootmem.h>
 #ifdef CONFIG_BLK_DEV_RAM
 #include <linux/blk.h>
 #endif
 
-#include <asm/asm.h>
+#include <asm/addrspace.h>
 #include <asm/bootinfo.h>
-#include <asm/cachectl.h>
 #include <asm/cpu.h>
+#include <asm/mipsregs.h>
 #include <asm/stackframe.h>
 #include <asm/system.h>
 #include <asm/pgalloc.h>
@@ -39,6 +43,15 @@
 struct cpuinfo_mips cpu_data[1];
 #endif
 
+/*
+ * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
+ * the implementation of the "wait" feature differs between CPU families. This
+ * points to the function that implements CPU specific wait. 
+ * The wait instruction stops the pipeline and reduces the power consumption of
+ * the CPU very much.
+ */
+void (*cpu_wait)(void) = NULL;
+
 #ifdef CONFIG_VT
 struct screen_info screen_info;
 #endif
@@ -51,11 +64,6 @@
 char wait_available;
 
 /*
- * Do we have a cyclecounter available?
- */
-char cyclecounter_available;
-
-/*
  * Set if box has EISA slots.
  */
 int EISA_bus = 0;
@@ -81,7 +89,6 @@
  *
  * These are initialized so they are in the .data section
  */
-unsigned long mips_cputype = CPU_UNKNOWN;
 unsigned long mips_machtype = MACH_UNKNOWN;
 unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
 
@@ -95,58 +102,648 @@
        char saved_command_line[CL_SIZE];
 extern char arcs_cmdline[CL_SIZE];
 
+/*
+ * mips_io_port_base is the begin of the address space to which x86 style
+ * I/O ports are mapped.
+ */
+const unsigned long mips_io_port_base = -1;
+EXPORT_SYMBOL(mips_io_port_base);
+
 extern void ip22_setup(void);
 extern void ip27_setup(void);
+extern void ip32_setup(void);
 
-static inline void cpu_probe(void)
-{
-	unsigned int prid = read_32bit_cp0_register(CP0_PRID);
+extern void sgi_sysinit(void);
+extern void SetUpBootInfo(void);
+extern void load_mmu(void);
+extern ATTRIB_NORET asmlinkage void start_kernel(void);
+extern void prom_init(int, char **, char **, int *);
 
-	switch(prid & 0xff00) {
-	case PRID_IMP_R4000:
-		if((prid & 0xff) == PRID_REV_R4400)
-			mips_cputype = CPU_R4400SC;
-		else
-			mips_cputype = CPU_R4000SC;
+static inline void check_wait(void)
+{
+	printk("Checking for 'wait' instruction... ");
+	switch(mips_cpu.cputype) {
+	case CPU_R3081:
+	case CPU_R3081E:
+		cpu_wait = r3081_wait;
+		printk(" available.\n");
 		break;
-	case PRID_IMP_R4600:
-		mips_cputype = CPU_R4600;
+	case CPU_TX3927:
+	case CPU_TX39XX:
+		cpu_wait = r39xx_wait;
+		printk(" available.\n");
 		break;
-	case PRID_IMP_R4700:
-		mips_cputype = CPU_R4700;
+	case CPU_R4200: 
+/*	case CPU_R4300: */
+	case CPU_R4600: 
+	case CPU_R4640: 
+	case CPU_R4650: 
+	case CPU_R4700: 
+	case CPU_R5000: 
+	case CPU_NEVADA:
+	case CPU_RM7000:
+	case CPU_TX49XX:
+	case CPU_4KC:
+	case CPU_4KEC:
+	case CPU_4KSC:
+	case CPU_5KC:
+/*	case CPU_20KC:*/
+		cpu_wait = r4k_wait;
+		printk(" available.\n");
 		break;
-	case PRID_IMP_R5000:
-		mips_cputype = CPU_R5000;
+	default:
+		printk(" unavailable.\n");
+		break;
+	}
+}
+
+void __init check_bugs(void)
+{
+	check_wait();
+}
+
+/*
+ * Probe whether cpu has config register by trying to play with
+ * alternate cache bit and see whether it matters.
+ * It's used by cpu_probe to distinguish between R3000A and R3081.
+ */
+static inline int cpu_has_confreg(void)
+{
+#ifdef CONFIG_CPU_R3000
+	extern unsigned long r3k_cache_size(unsigned long);
+	unsigned long size1, size2;
+	unsigned long cfg = read_32bit_cp0_register(CP0_CONF);
+
+	size1 = r3k_cache_size(ST0_ISC);
+	write_32bit_cp0_register(CP0_CONF, cfg^CONF_AC);
+	size2 = r3k_cache_size(ST0_ISC);
+	write_32bit_cp0_register(CP0_CONF, cfg);
+	return size1 != size2;
+#else
+	return 0;
+#endif
+}
+
+/*
+ * Get the FPU Implementation/Revision.
+ */
+static inline unsigned long cpu_get_fpu_id(void)
+{
+	unsigned long tmp, fpu_id;
+
+	tmp = read_32bit_cp0_register(CP0_STATUS);
+	__enable_fpu();
+	fpu_id = read_32bit_cp1_register(CP1_REVISION);
+	write_32bit_cp0_register(CP0_STATUS, tmp);
+	return fpu_id;
+}
+
+/* declaration of the global struct */
+struct mips_cpu mips_cpu = {
+    processor_id:	PRID_IMP_UNKNOWN,
+    fpu_id:		FPIR_IMP_NONE,
+    cputype:		CPU_UNKNOWN
+};
+
+#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4KTLB \
+                | MIPS_CPU_COUNTER | MIPS_CPU_CACHE_CDEX)
+
+static inline void cpu_probe(void)
+{
+#ifdef CONFIG_CPU_MIPS32
+	unsigned long config0 = read_32bit_cp0_register(CP0_CONFIG);
+	unsigned long config1;
+
+        if (config0 & (1 << 31)) {
+		/* MIPS32 compliant CPU. Read Config 1 register. */
+		mips_cpu.isa_level = MIPS_CPU_ISA_M32;
+		mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | 
+			MIPS_CPU_4KTLB | MIPS_CPU_COUNTER | MIPS_CPU_DIVEC;
+		config1 = read_mips32_cp0_config1();
+		if (config1 & (1 << 3))
+			mips_cpu.options |= MIPS_CPU_WATCH;
+		if (config1 & (1 << 2))
+			mips_cpu.options |= MIPS_CPU_MIPS16;
+		if (config1 & (1 << 1))
+			mips_cpu.options |= MIPS_CPU_EJTAG;
+		if (config1 & 1)
+			mips_cpu.options |= MIPS_CPU_FPU;
+		mips_cpu.scache.flags = MIPS_CACHE_NOT_PRESENT;
+	}
+#endif
+	mips_cpu.processor_id = read_32bit_cp0_register(CP0_PRID);
+	switch (mips_cpu.processor_id & 0xff0000) {
+	case PRID_COMP_LEGACY:
+		switch (mips_cpu.processor_id & 0xff00) {
+		case PRID_IMP_R2000:
+			mips_cpu.cputype = CPU_R2000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_I;
+			mips_cpu.options = MIPS_CPU_TLB;
+			mips_cpu.tlbsize = 64;
+			break;
+		case PRID_IMP_R3000:
+			if ((mips_cpu.processor_id & 0xff) == PRID_REV_R3000A)
+				if (cpu_has_confreg())
+					mips_cpu.cputype = CPU_R3081E;
+				else
+					mips_cpu.cputype = CPU_R3000A;
+			else
+				mips_cpu.cputype = CPU_R3000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_I;
+			mips_cpu.options = MIPS_CPU_TLB;
+			mips_cpu.tlbsize = 64;
+			break;
+		case PRID_IMP_R4000:
+			if ((mips_cpu.processor_id & 0xff) == PRID_REV_R4400)
+				mips_cpu.cputype = CPU_R4400SC;
+			else
+				mips_cpu.cputype = CPU_R4000SC;
+			mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR | MIPS_CPU_WATCH |
+			                   MIPS_CPU_VCE;
+			mips_cpu.tlbsize = 48;
+			break;
+                case PRID_IMP_VR41XX:
+                        mips_cpu.cputype = CPU_VR41XX;
+                        mips_cpu.isa_level = MIPS_CPU_ISA_III;
+                        mips_cpu.options = R4K_OPTS;
+                        mips_cpu.tlbsize = 32;
+                        break;
+		case PRID_IMP_R4300:
+			mips_cpu.cputype = CPU_R4300;
+			mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR;
+			mips_cpu.tlbsize = 32;
+			break;
+		case PRID_IMP_R4600:
+			mips_cpu.cputype = CPU_R4600;
+			mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU;
+			mips_cpu.tlbsize = 48;
+			break;
+		#if 0
+ 		case PRID_IMP_R4650:
+			/*
+			 * This processor doesn't have an MMU, so it's not
+			 * "real easy" to run Linux on it. It is left purely
+			 * for documentation.  Commented out because it shares
+			 * it's c0_prid id number with the TX3900.
+			 */
+	 		mips_cpu.cputype = CPU_R4650;
+		 	mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU;
+		        mips_cpu.tlbsize = 48;
+			break;
+		#endif
+		case PRID_IMP_TX39:
+			mips_cpu.isa_level = MIPS_CPU_ISA_I;
+			mips_cpu.options = MIPS_CPU_TLB;
+
+			if ((mips_cpu.processor_id & 0xf0) ==
+			    (PRID_REV_TX3927 & 0xf0)) {
+				mips_cpu.cputype = CPU_TX3927;
+				mips_cpu.tlbsize = 64;
+				mips_cpu.icache.ways = 2;
+				mips_cpu.dcache.ways = 2;
+			} else {
+				switch (mips_cpu.processor_id & 0xff) {
+				case PRID_REV_TX3912:
+					mips_cpu.cputype = CPU_TX3912;
+					mips_cpu.tlbsize = 32;
+					break;
+				case PRID_REV_TX3922:
+					mips_cpu.cputype = CPU_TX3922;
+					mips_cpu.tlbsize = 64;
+					break;
+				default:
+					mips_cpu.cputype = CPU_UNKNOWN;
+					break;
+				}
+			}
+			break;
+		case PRID_IMP_R4700:
+			mips_cpu.cputype = CPU_R4700;
+			mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR;
+			mips_cpu.tlbsize = 48;
+			break;
+		case PRID_IMP_TX49:
+			mips_cpu.cputype = CPU_TX49XX;
+			mips_cpu.isa_level = MIPS_CPU_ISA_III;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR;
+			mips_cpu.tlbsize = 48;
+			mips_cpu.icache.ways = 4;
+			mips_cpu.dcache.ways = 4;
+			break;
+		case PRID_IMP_R5000:
+			mips_cpu.cputype = CPU_R5000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV; 
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR;
+			mips_cpu.tlbsize = 48;
+			break;
+		case PRID_IMP_R5432:
+			mips_cpu.cputype = CPU_R5432;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV; 
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR | MIPS_CPU_WATCH;
+			mips_cpu.tlbsize = 48;
+			break;
+		case PRID_IMP_R5500:
+			mips_cpu.cputype = CPU_R5500;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV; 
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR | MIPS_CPU_WATCH;
+			mips_cpu.tlbsize = 48;
+			break;
+		case PRID_IMP_NEVADA:
+			mips_cpu.cputype = CPU_NEVADA;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV; 
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR | MIPS_CPU_DIVEC;
+			mips_cpu.tlbsize = 48;
+			mips_cpu.icache.ways = 2;
+			mips_cpu.dcache.ways = 2;
+			break;
+		case PRID_IMP_R6000:
+			mips_cpu.cputype = CPU_R6000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_II;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_FPU;
+			mips_cpu.tlbsize = 32;
+			break;
+		case PRID_IMP_R6000A:
+			mips_cpu.cputype = CPU_R6000A;
+			mips_cpu.isa_level = MIPS_CPU_ISA_II;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_FPU;
+			mips_cpu.tlbsize = 32;
+			break;
+		case PRID_IMP_RM7000:
+			mips_cpu.cputype = CPU_RM7000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV;
+			mips_cpu.options = R4K_OPTS | MIPS_CPU_FPU |
+			                   MIPS_CPU_32FPR;
+			/*
+			 * Undocumented RM7000:  Bit 29 in the info register of
+			 * the RM7000 v2.0 indicates if the TLB has 48 or 64
+			 * entries.
+			 *
+			 * 29      1 =>    64 entry JTLB
+			 *         0 =>    48 entry JTLB
+			 */
+			mips_cpu.tlbsize = (get_info() & (1 << 29)) ? 64 : 48;
+			break;
+		case PRID_IMP_R8000:
+			mips_cpu.cputype = CPU_R8000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
+				           MIPS_CPU_FPU | MIPS_CPU_32FPR;
+			mips_cpu.tlbsize = 384;      /* has wierd TLB: 3-way x 128 */
+			break;
+		case PRID_IMP_R10000:
+			mips_cpu.cputype = CPU_R10000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | 
+				           MIPS_CPU_FPU | MIPS_CPU_32FPR | 
+				           MIPS_CPU_COUNTER | MIPS_CPU_WATCH;
+			mips_cpu.tlbsize = 64;
+			break;
+		case PRID_IMP_R12000:
+			mips_cpu.cputype = CPU_R12000;
+			mips_cpu.isa_level = MIPS_CPU_ISA_IV;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX | 
+				           MIPS_CPU_FPU | MIPS_CPU_32FPR | 
+				           MIPS_CPU_COUNTER | MIPS_CPU_WATCH;
+			mips_cpu.tlbsize = 64;
+			break;
+		default:
+			mips_cpu.cputype = CPU_UNKNOWN;
+			break;
+		}
 		break;
-	case PRID_IMP_NEVADA:
-		mips_cputype = CPU_NEVADA;
+#ifdef CONFIG_CPU_MIPS32
+	case PRID_COMP_MIPS:
+		switch (mips_cpu.processor_id & 0xff00) {
+		case PRID_IMP_4KC:
+			mips_cpu.cputype = CPU_4KC;
+			break;
+		case PRID_IMP_4KEC:
+			mips_cpu.cputype = CPU_4KEC;
+			break;
+		case PRID_IMP_4KSC:
+			mips_cpu.cputype = CPU_4KSC;
+			break;
+		case PRID_IMP_5KC:
+			mips_cpu.cputype = CPU_5KC;
+			mips_cpu.isa_level = MIPS_CPU_ISA_M64;
+			break;
+		case PRID_IMP_20KC:
+			mips_cpu.cputype = CPU_20KC;
+			mips_cpu.isa_level = MIPS_CPU_ISA_M64;
+		default:
+			mips_cpu.cputype = CPU_UNKNOWN;
+			break;
+		}		
 		break;
-	case PRID_IMP_R8000:
-		mips_cputype = CPU_R8000;
+	case PRID_COMP_ALCHEMY:
+		switch (mips_cpu.processor_id & 0xff00) {
+		case PRID_IMP_AU1_REV1:
+		case PRID_IMP_AU1_REV2:
+			if (mips_cpu.processor_id & 0xff000000)
+				mips_cpu.cputype = CPU_AU1500;
+			else
+				mips_cpu.cputype = CPU_AU1000;
+			break;
+		default:
+			mips_cpu.cputype = CPU_UNKNOWN;
+			break;
+		}
 		break;
-	case PRID_IMP_R10000:
-	case PRID_IMP_R12000:
-		mips_cputype = CPU_R10000;
+#endif /* CONFIG_CPU_MIPS32 */
+	case PRID_COMP_SIBYTE:
+		switch (mips_cpu.processor_id & 0xff00) {
+		case PRID_IMP_SB1:
+			mips_cpu.cputype = CPU_SB1;
+			mips_cpu.isa_level = MIPS_CPU_ISA_M64;
+			mips_cpu.options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
+			                   MIPS_CPU_COUNTER | MIPS_CPU_DIVEC |
+			                   MIPS_CPU_MCHECK;
+#ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
+			/* FPU in pass1 is known to have issues. */
+			mips_cpu.options |= MIPS_CPU_FPU;
+#endif
+			break;
+		default:
+			mips_cpu.cputype = CPU_UNKNOWN;
+			break;
+		}
 		break;
 	default:
-		mips_cputype = CPU_UNKNOWN;
+		mips_cpu.cputype = CPU_UNKNOWN;
 	}
+	if (mips_cpu.options & MIPS_CPU_FPU)
+		mips_cpu.fpu_id = cpu_get_fpu_id();
 }
 
-void __init setup_arch(char **cmdline_p)
+static inline void cpu_report(void)
 {
+	printk("CPU revision is: %08x\n", mips_cpu.processor_id);
+	if (mips_cpu.options & MIPS_CPU_FPU)
+		printk("FPU revision is: %08x\n", mips_cpu.fpu_id);
+}
+
+asmlinkage void __init init_arch(int argc, char **argv, char **envp,
+	int *prom_vec)
+{
+	/* Determine which MIPS variant we are running on. */
 	cpu_probe();
+
+	prom_init(argc, argv, envp, prom_vec);
+
+#ifdef CONFIG_SGI_IP22
+	sgi_sysinit();
+#endif
+
+	cpu_report();
+
+	/*
+	 * Determine the mmu/cache attached to this machine, then flush the
+	 * tlb and caches.  On the r4xx0 variants this also sets CP0_WIRED to
+	 * zero.
+	 */
 	load_mmu();
 
+	/*
+	 * On IP27, I am seeing the TS bit set when the kernel is loaded.
+	 * Maybe because the kernel is in ckseg0 and not xkphys? Clear it
+	 * anyway ...
+	 */
+	clear_cp0_status(ST0_BEV|ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3);
+	set_cp0_status(ST0_CU0|ST0_KX|ST0_SX|ST0_FR);
+
+	start_kernel();
+}
+
+void __init add_memory_region(phys_t start, phys_t size,
+			      long type)
+{
+	int x = boot_mem_map.nr_map;
+
+	if (x == BOOT_MEM_MAP_MAX) {
+		printk("Ooops! Too many entries in the memory map!\n");
+		return;
+	}
+
+	boot_mem_map.map[x].addr = start;
+	boot_mem_map.map[x].size = size;
+	boot_mem_map.map[x].type = type;
+	boot_mem_map.nr_map++;
+}
+
+static void __init print_memory_map(void)
+{
+	int i;
+
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		printk(" memory: %08Lx @ %08Lx ",
+			(unsigned long long) boot_mem_map.map[i].size,
+			(unsigned long long) boot_mem_map.map[i].addr);
+		switch (boot_mem_map.map[i].type) {
+		case BOOT_MEM_RAM:
+			printk("(usable)\n");
+			break;
+		case BOOT_MEM_ROM_DATA:
+			printk("(ROM data)\n");
+			break;
+		case BOOT_MEM_RESERVED:
+			printk("(reserved)\n");
+			break;
+		default:
+			printk("type %lu\n", boot_mem_map.map[i].type);
+			break;
+		}
+	}
+}
+
+static inline void parse_mem_cmdline(void)
+{
+	char c = ' ', *to = command_line, *from = saved_command_line;
+	unsigned long start_at, mem_size;
+	int len = 0;
+	int usermem = 0;
+
+	printk("Determined physical RAM map:\n");
+	print_memory_map();
+
+	for (;;) {
+		/*
+		 * "mem=XXX[kKmM]" defines a memory region from
+		 * 0 to <XXX>, overriding the determined size.
+		 * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from
+		 * <YYY> to <YYY>+<XXX>, overriding the determined size.
+		 */
+		if (c == ' ' && !memcmp(from, "mem=", 4)) {
+			if (to != command_line)
+				to--;
+			/*
+			 * If a user specifies memory size, we
+			 * blow away any automatically generated
+			 * size.
+			 */
+			if (usermem == 0) {
+				boot_mem_map.nr_map = 0;
+				usermem = 1;
+			}
+			mem_size = memparse(from + 4, &from);
+			if (*from == '@')
+				start_at = memparse(from + 1, &from);
+			else
+				start_at = 0;
+			add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
+		}
+		c = *(from++);
+		if (!c)
+			break;
+		if (CL_SIZE <= ++len)
+			break;
+		*(to++) = c;
+	}
+	*to = '\0';
+
+	if (usermem) {
+		printk("User-defined physical RAM map:\n");
+		print_memory_map();
+	}
+}
+
+void bootmem_init(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+	unsigned long tmp;
+	unsigned long *initrd_header;
+#endif
+	unsigned long bootmap_size;
+	unsigned long start_pfn, max_pfn;
+	int i;
+	extern int _end;
+
+#define PFN_UP(x)	(((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
+#define PFN_DOWN(x)	((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x)	((x) << PAGE_SHIFT)
+
+	/*
+	 * Partially used pages are not usable - thus
+	 * we are rounding upwards.
+	 * start_pfn = PFN_UP(__pa(&_end));
+	 */
+	start_pfn = PFN_UP((unsigned long)&_end - KSEG0);
+
+	/* Find the highest page frame number we have available.  */
+	max_pfn = 0;
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		unsigned long start, end;
+
+		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+			continue;
+
+		start = PFN_UP(boot_mem_map.map[i].addr);
+		end = PFN_DOWN(boot_mem_map.map[i].addr
+		      + boot_mem_map.map[i].size);
+
+		if (start >= end)
+			continue;
+		if (end > max_pfn)
+			max_pfn = end;
+	}
+
+	/* Initialize the boot-time allocator.  */
+	bootmap_size = init_bootmem(start_pfn, max_pfn);
+
+	/*
+	 * Register fully available low RAM pages with the bootmem allocator.
+	 */
+	for (i = 0; i < boot_mem_map.nr_map; i++) {
+		unsigned long curr_pfn, last_pfn, size;
+
+		/*
+		 * Reserve usable memory.
+		 */
+		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+			continue;
+
+		/*
+		 * We are rounding up the start address of usable memory:
+		 */
+		curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
+		if (curr_pfn >= max_pfn)
+			continue;
+		if (curr_pfn < start_pfn)
+			curr_pfn = start_pfn;
+
+		/*
+		 * ... and at the end of the usable range downwards:
+		 */
+		last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
+				    + boot_mem_map.map[i].size);
+
+		if (last_pfn > max_pfn)
+			last_pfn = max_pfn;
+
+		/*
+		 * ... finally, did all the rounding and playing
+		 * around just make the area go away?
+		 */
+		if (last_pfn <= curr_pfn)
+			continue;
+
+		size = last_pfn - curr_pfn;
+		free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+	}
+
+	/* Reserve the bootmap memory.  */
+	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+#error "Initrd is broken, please fit it."
+	tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
+	if (tmp < (unsigned long)&_end)
+		tmp += PAGE_SIZE;
+	initrd_header = (unsigned long *)tmp;
+	if (initrd_header[0] == 0x494E5244) {
+		initrd_start = (unsigned long)&initrd_header[2];
+		initrd_end = initrd_start + initrd_header[1];
+		initrd_below_start_ok = 1;
+		if (initrd_end > memory_end) {
+			printk("initrd extends beyond end of memory "
+			       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+			       initrd_end,memory_end);
+			initrd_start = 0;
+		} else
+			*memory_start_p = initrd_end;
+	}
+#endif
+
+#undef PFN_UP
+#undef PFN_DOWN
+#undef PFN_PHYS
+
+}
+
+void __init setup_arch(char **cmdline_p)
+{
 #ifdef CONFIG_SGI_IP22
 	ip22_setup();
 #endif
 #ifdef CONFIG_SGI_IP27
 	ip27_setup();
 #endif
-
-#ifdef CONFIG_ARC_MEMORY
-	bootmem_init ();
+#ifdef CONFIG_SGI_IP32
+	ip32_setup();
+#endif
+#ifdef CONFIG_SIBYTE_SWARM
+	swarm_setup();
 #endif
 
 	strncpy(command_line, arcs_cmdline, CL_SIZE);
@@ -155,5 +752,35 @@
 
 	*cmdline_p = command_line;
 
+	parse_mem_cmdline();
+
+	bootmem_init();
+
 	paging_init();
 }
+
+void r3081_wait(void) 
+{
+	unsigned long cfg = read_32bit_cp0_register(CP0_CONF);
+	write_32bit_cp0_register(CP0_CONF, cfg|CONF_HALT);
+}
+
+void r39xx_wait(void)
+{
+	unsigned long cfg = read_32bit_cp0_register(CP0_CONF);
+	write_32bit_cp0_register(CP0_CONF, cfg|TX39_CONF_HALT);
+}
+
+void r4k_wait(void)
+{
+	__asm__(".set\tmips3\n\t"
+		"wait\n\t"
+		".set\tmips0");
+}
+
+int __init fpu_disable(char *s)
+{
+	mips_cpu.options &= ~MIPS_CPU_FPU;
+	return 1;
+}
+__setup("nofpu", fpu_disable);