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!
285 lines
7.5 KiB
C
285 lines
7.5 KiB
C
/*
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* arch/ppc/simple/misc.c
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*
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* Misc. bootloader code for many machines. This assumes you have are using
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* a 6xx/7xx/74xx CPU in your machine. This assumes the chunk of memory
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* below 8MB is free. Finally, it assumes you have a NS16550-style uart for
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* your serial console. If a machine meets these requirements, it can quite
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* likely use this code during boot.
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*
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* Author: Matt Porter <mporter@mvista.com>
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* Derived from arch/ppc/boot/prep/misc.c
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*
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* 2001 (c) MontaVista, Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/types.h>
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#include <linux/config.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/bootinfo.h>
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#ifdef CONFIG_44x
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#include <asm/ibm4xx.h>
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#endif
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#include <asm/reg.h>
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#include "nonstdio.h"
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/* Default cmdline */
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#ifdef CONFIG_CMDLINE
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#define CMDLINE CONFIG_CMDLINE
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#else
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#define CMDLINE ""
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#endif
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/* Keyboard (and VGA console)? */
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#ifdef CONFIG_VGA_CONSOLE
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#define HAS_KEYB 1
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#else
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#define HAS_KEYB 0
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#endif
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/* Will / Can the user give input?
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* Val Henson has requested that Gemini doesn't wait for the
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* user to edit the cmdline or not.
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*/
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#if (defined(CONFIG_SERIAL_8250_CONSOLE) \
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|| defined(CONFIG_VGA_CONSOLE) \
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|| defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
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|| defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
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&& !defined(CONFIG_GEMINI)
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#define INTERACTIVE_CONSOLE 1
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#endif
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char *avail_ram;
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char *end_avail;
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char *zimage_start;
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char cmd_preset[] = CMDLINE;
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char cmd_buf[256];
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char *cmd_line = cmd_buf;
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int keyb_present = HAS_KEYB;
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int zimage_size;
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unsigned long com_port;
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unsigned long initrd_size = 0;
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/* The linker tells us various locations in the image */
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extern char __image_begin, __image_end;
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extern char __ramdisk_begin, __ramdisk_end;
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extern char _end[];
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/* Original location */
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extern unsigned long start;
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extern int CRT_tstc(void);
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extern unsigned long serial_init(int chan, void *ignored);
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extern void serial_close(unsigned long com_port);
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extern void gunzip(void *, int, unsigned char *, int *);
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extern void serial_fixups(void);
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/* Allow get_mem_size to be hooked into. This is the default. */
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unsigned long __attribute__ ((weak))
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get_mem_size(void)
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{
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return 0;
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}
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struct bi_record *
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decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
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{
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#ifdef INTERACTIVE_CONSOLE
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int timer = 0;
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char ch;
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#endif
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char *cp;
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struct bi_record *rec;
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unsigned long initrd_loc = 0, TotalMemory = 0;
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#if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
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com_port = serial_init(0, NULL);
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#endif
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#if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
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/* Reset MAL */
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mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
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/* Wait for reset */
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while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
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/* Reset EMAC */
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*(volatile unsigned long *)PPC44x_EMAC0_MR0 = 0x20000000;
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__asm__ __volatile__("eieio");
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#endif
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/*
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* Call get_mem_size(), which is memory controller dependent,
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* and we must have the correct file linked in here.
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*/
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TotalMemory = get_mem_size();
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/* assume the chunk below 8M is free */
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end_avail = (char *)0x00800000;
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/*
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* Reveal where we were loaded at and where we
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* were relocated to.
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*/
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puts("loaded at: "); puthex(load_addr);
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puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
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puts("\n");
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if ( (unsigned long)load_addr != (unsigned long)&start )
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{
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puts("relocated to: "); puthex((unsigned long)&start);
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puts(" ");
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puthex((unsigned long)((unsigned long)&start + (4*num_words)));
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puts("\n");
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}
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/*
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* We link ourself to 0x00800000. When we run, we relocate
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* ourselves there. So we just need __image_begin for the
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* start. -- Tom
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*/
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zimage_start = (char *)(unsigned long)(&__image_begin);
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zimage_size = (unsigned long)(&__image_end) -
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(unsigned long)(&__image_begin);
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initrd_size = (unsigned long)(&__ramdisk_end) -
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(unsigned long)(&__ramdisk_begin);
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/*
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* The zImage and initrd will be between start and _end, so they've
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* already been moved once. We're good to go now. -- Tom
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*/
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avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
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puts("zimage at: "); puthex((unsigned long)zimage_start);
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puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
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puts("\n");
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if ( initrd_size ) {
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puts("initrd at: ");
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puthex((unsigned long)(&__ramdisk_begin));
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puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
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}
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avail_ram = (char *)0x00400000;
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end_avail = (char *)0x00800000;
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puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
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puthex((unsigned long)end_avail); puts("\n");
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if (keyb_present)
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CRT_tstc(); /* Forces keyboard to be initialized */
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#ifdef CONFIG_GEMINI
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/*
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* If cmd_line is empty and cmd_preset is not, copy cmd_preset
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* to cmd_line. This way we can override cmd_preset with the
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* command line from Smon.
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*/
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if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
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memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
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#endif
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/* Display standard Linux/PPC boot prompt for kernel args */
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puts("\nLinux/PPC load: ");
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cp = cmd_line;
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memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
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while ( *cp ) putc(*cp++);
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#ifdef INTERACTIVE_CONSOLE
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/*
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* If they have a console, allow them to edit the command line.
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* Otherwise, don't bother wasting the five seconds.
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*/
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while (timer++ < 5*1000) {
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if (tstc()) {
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while ((ch = getc()) != '\n' && ch != '\r') {
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/* Test for backspace/delete */
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if (ch == '\b' || ch == '\177') {
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if (cp != cmd_line) {
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cp--;
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puts("\b \b");
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}
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/* Test for ^x/^u (and wipe the line) */
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} else if (ch == '\030' || ch == '\025') {
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while (cp != cmd_line) {
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cp--;
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puts("\b \b");
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}
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} else {
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*cp++ = ch;
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putc(ch);
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}
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}
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break; /* Exit 'timer' loop */
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}
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udelay(1000); /* 1 msec */
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}
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*cp = 0;
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#endif
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puts("\n");
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puts("Uncompressing Linux...");
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gunzip(0x0, 0x400000, zimage_start, &zimage_size);
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puts("done.\n");
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/* get the bi_rec address */
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rec = bootinfo_addr(zimage_size);
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/* We need to make sure that the initrd and bi_recs do not
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* overlap. */
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if ( initrd_size ) {
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unsigned long rec_loc = (unsigned long) rec;
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initrd_loc = (unsigned long)(&__ramdisk_begin);
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/* If the bi_recs are in the middle of the current
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* initrd, move the initrd to the next MB
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* boundary. */
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if ((rec_loc > initrd_loc) &&
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((initrd_loc + initrd_size) > rec_loc)) {
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initrd_loc = _ALIGN((unsigned long)(zimage_size)
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+ (2 << 20) - 1, (2 << 20));
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memmove((void *)initrd_loc, &__ramdisk_begin,
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initrd_size);
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puts("initrd moved: "); puthex(initrd_loc);
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puts(" "); puthex(initrd_loc + initrd_size);
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puts("\n");
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}
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}
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bootinfo_init(rec);
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if ( TotalMemory )
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bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
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bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
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/* add a bi_rec for the initrd if it exists */
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if (initrd_size) {
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unsigned long initrd[2];
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initrd[0] = initrd_loc;
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initrd[1] = initrd_size;
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bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
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}
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puts("Now booting the kernel\n");
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serial_close(com_port);
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return rec;
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}
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void __attribute__ ((weak))
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board_isa_init(void)
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{
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}
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/* Allow decompress_kernel to be hooked into. This is the default. */
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void * __attribute__ ((weak))
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load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
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void *ign1, void *ign2)
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{
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board_isa_init();
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return decompress_kernel(load_addr, num_words, cksum);
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}
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