patch-2.1.79 linux/arch/alpha/boot/bootp.c

• Lines: 223
• Date: Mon Jan 12 14:51:14 1998
• Orig file: v2.1.78/linux/arch/alpha/boot/bootp.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.78/linux/arch/alpha/boot/bootp.c linux/arch/alpha/boot/bootp.c
@@ -0,0 +1,222 @@
+/*
+ * arch/alpha/boot/bootp.c
+ *
+ * Copyright (C) 1997 Jay Estabrook
+ *
+ * This file is used for creating a bootp file for the Linux/AXP kernel
+ *
+ * based significantly on the arch/alpha/boot/main.c of Linus Torvalds
+ */
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/version.h>
+#include <linux/mm.h>
+
+#include <asm/system.h>
+#include <asm/console.h>
+#include <asm/hwrpb.h>
+#include <asm/pgtable.h>
+
+#include <stdarg.h>
+
+#include "ksize.h"
+
+extern int vsprintf(char *, const char *, va_list);
+extern unsigned long switch_to_osf_pal(unsigned long nr,
+	struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
+	unsigned long vptb, unsigned long *kstk);
+
+int printk(const char * fmt, ...)
+{
+	va_list args;
+	int i, j, written, remaining, num_nl;
+	static char buf[1024];
+	char * str;
+
+	va_start(args, fmt);
+	i = vsprintf(buf, fmt, args);
+	va_end(args);
+
+	/* expand \n into \r\n: */
+
+	num_nl = 0;
+	for (j = 0; j < i; ++j) {
+	    if (buf[j] == '\n')
+	    	++num_nl;
+	}
+	remaining = i + num_nl;
+	for (j = i - 1; j >= 0; --j) {
+	    buf[j + num_nl] = buf[j];
+	    if (buf[j] == '\n') {
+	    	--num_nl;
+		buf[j + num_nl] = '\r';
+	    }
+	}
+
+	str = buf;
+	do {
+	    written = puts(str, remaining);
+	    remaining -= written;
+	    str += written;
+	} while (remaining > 0);
+	return i;
+}
+
+#define hwrpb (*INIT_HWRPB)
+
+/*
+ * Find a physical address of a virtual object..
+ *
+ * This is easy using the virtual page table address.
+ */
+struct pcb_struct * find_pa(unsigned long *vptb, struct pcb_struct * pcb)
+{
+	unsigned long address = (unsigned long) pcb;
+	unsigned long result;
+
+	result = vptb[address >> 13];
+	result >>= 32;
+	result <<= 13;
+	result |= address & 0x1fff;
+	return (struct pcb_struct *) result;
+}	
+
+/*
+ * This function moves into OSF/1 pal-code, and has a temporary
+ * PCB for that. The kernel proper should replace this PCB with
+ * the real one as soon as possible.
+ *
+ * The page table muckery in here depends on the fact that the boot
+ * code has the L1 page table identity-map itself in the second PTE
+ * in the L1 page table. Thus the L1-page is virtually addressable
+ * itself (through three levels) at virtual address 0x200802000.
+ *
+ * As we don't want it there anyway, we also move the L1 self-map
+ * up as high as we can, so that the last entry in the L1 page table
+ * maps the page tables.
+ *
+ * As a result, the OSF/1 pal-code will instead use a virtual page table
+ * map located at 0xffffffe00000000.
+ */
+#define pcb_va ((struct pcb_struct *) 0x20000000)
+#define old_vptb (0x0000000200000000UL)
+#define new_vptb (0xfffffffe00000000UL)
+void pal_init(void)
+{
+	unsigned long i, rev, sum;
+	unsigned long *L1, *l;
+	struct percpu_struct * percpu;
+	struct pcb_struct * pcb_pa;
+
+	/* Find the level 1 page table and duplicate it in high memory */
+	L1 = (unsigned long *) 0x200802000UL; /* (1<<33 | 1<<23 | 1<<13) */
+	L1[1023] = L1[1];
+
+	percpu = (struct percpu_struct *)
+			(hwrpb.processor_offset + (unsigned long) &hwrpb),
+		
+	pcb_va->ksp = 0;
+	pcb_va->usp = 0;
+	pcb_va->ptbr = L1[1] >> 32;
+	pcb_va->asn = 0;
+	pcb_va->pcc = 0;
+	pcb_va->unique = 0;
+	pcb_va->flags = 1;
+	pcb_pa = find_pa((unsigned long *) old_vptb, pcb_va);
+	printk("Switching to OSF PAL-code .. ");
+	/*
+	 * a0 = 2 (OSF)
+	 * a1 = return address, but we give the asm the vaddr of the PCB
+	 * a2 = physical addr of PCB
+	 * a3 = new virtual page table pointer
+	 * a4 = KSP (but we give it 0, asm sets it)
+	 */
+	i = switch_to_osf_pal(
+		2,
+		pcb_va,
+		pcb_pa,
+		new_vptb,
+		0);
+	if (i) {
+		printk("failed, code %ld\n", i);
+		halt();
+	}
+	rev = percpu->pal_revision = percpu->palcode_avail[2];
+
+	hwrpb.vptb = new_vptb;
+
+	/* update checksum: */
+	sum = 0;
+	for (l = (unsigned long *) &hwrpb;
+	     l < (unsigned long *) &hwrpb.chksum;
+	     ++l)
+		sum += *l;
+	hwrpb.chksum = sum;
+
+	printk("Ok (rev %lx)\n", rev);
+	/* remove the old virtual page-table mapping */
+	L1[1] = 0;
+	flush_tlb_all();
+}
+
+static inline long load(unsigned long dst,
+			unsigned long src,
+			unsigned long count)
+{
+	extern void * memcpy(void *, const void *, size_t);
+
+	memcpy((void *)dst, (void *)src, count);
+	return count;
+}
+
+/*
+ * Start the kernel.
+ */
+static void runkernel(void)
+{
+	__asm__ __volatile__(
+		"bis %1,%1,$30\n\t"
+		"bis %0,%0,$27\n\t"
+		"jmp ($27)"
+		: /* no outputs: it doesn't even return */
+		: "r" (START_ADDR),
+		  "r" (PAGE_SIZE + INIT_STACK));
+}
+
+extern char _end;
+#define KERNEL_ORIGIN \
+	((((unsigned long)&_end) + 511) & ~511)
+
+void start_kernel(void)
+{
+	long i;
+	int nbytes;
+	char envval[256];
+
+	printk("Linux/AXP bootp loader for Linux " UTS_RELEASE "\n");
+	if (hwrpb.pagesize != 8192) {
+		printk("Expected 8kB pages, got %ldkB\n", hwrpb.pagesize >> 10);
+		return;
+	}
+	pal_init();
+
+	nbytes = dispatch(CCB_GET_ENV, ENV_BOOTED_OSFLAGS,
+			  envval, sizeof(envval));
+	if (nbytes < 0) {
+		nbytes = 0;
+	}
+	envval[nbytes] = '\0';
+	strcpy((char*)ZERO_PAGE, envval);
+
+	printk("Loading the kernel ...\n");
+
+	/* NOTE: *no* callbacks or printouts from here on out!!! */
+
+	i = load(START_ADDR, KERNEL_ORIGIN, KERNEL_SIZE);
+
+	runkernel();
+
+	for (i = 0 ; i < 0x100000000 ; i++)
+		/* nothing */;
+	halt();
+}