1 files changed, 284 insertions, 0 deletions

diff --git a/arch/ppc/boot/simple/misc.c b/arch/ppc/boot/simple/misc.c
new file mode 100644
index 000000000000..ab0f9902cb67
--- /dev/null
+++ b/arch/ppc/boot/simple/misc.c
@@ -0,0 +1,284 @@
+/*
+ * arch/ppc/simple/misc.c
+ *
+ * Misc. bootloader code for many machines.  This assumes you have are using
+ * a 6xx/7xx/74xx CPU in your machine.  This assumes the chunk of memory
+ * below 8MB is free.  Finally, it assumes you have a NS16550-style uart for
+ * your serial console.  If a machine meets these requirements, it can quite
+ * likely use this code during boot.
+ *
+ * Author: Matt Porter <mporter@mvista.com>
+ * Derived from arch/ppc/boot/prep/misc.c
+ *
+ * 2001 (c) MontaVista, Software, Inc.  This file is licensed under
+ * the terms of the GNU General Public License version 2.  This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/types.h>
+#include <linux/config.h>
+#include <linux/string.h>
+
+#include <asm/page.h>
+#include <asm/mmu.h>
+#include <asm/bootinfo.h>
+#ifdef CONFIG_44x
+#include <asm/ibm4xx.h>
+#endif
+#include <asm/reg.h>
+
+#include "nonstdio.h"
+
+/* Default cmdline */
+#ifdef CONFIG_CMDLINE
+#define CMDLINE CONFIG_CMDLINE
+#else
+#define CMDLINE ""
+#endif
+
+/* Keyboard (and VGA console)? */
+#ifdef CONFIG_VGA_CONSOLE
+#define HAS_KEYB 1
+#else
+#define HAS_KEYB 0
+#endif
+
+/* Will / Can the user give input?
+ * Val Henson has requested that Gemini doesn't wait for the
+ * user to edit the cmdline or not.
+ */
+#if (defined(CONFIG_SERIAL_8250_CONSOLE) \
+        || defined(CONFIG_VGA_CONSOLE) \
+        || defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
+        || defined(CONFIG_SERIAL_MPSC_CONSOLE)) \
+        && !defined(CONFIG_GEMINI)
+#define INTERACTIVE_CONSOLE     1
+#endif
+
+char *avail_ram;
+char *end_avail;
+char *zimage_start;
+char cmd_preset[] = CMDLINE;
+char cmd_buf[256];
+char *cmd_line = cmd_buf;
+int keyb_present = HAS_KEYB;
+int zimage_size;
+
+unsigned long com_port;
+unsigned long initrd_size = 0;
+
+/* The linker tells us various locations in the image */
+extern char __image_begin, __image_end;
+extern char __ramdisk_begin, __ramdisk_end;
+extern char _end[];
+/* Original location */
+extern unsigned long start;
+
+extern int CRT_tstc(void);
+extern unsigned long serial_init(int chan, void *ignored);
+extern void serial_close(unsigned long com_port);
+extern void gunzip(void *, int, unsigned char *, int *);
+extern void serial_fixups(void);
+
+/* Allow get_mem_size to be hooked into.  This is the default. */
+unsigned long __attribute__ ((weak))
+get_mem_size(void)
+{
+        return 0;
+}
+
+struct bi_record *
+decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
+{
+#ifdef INTERACTIVE_CONSOLE
+        int timer = 0;
+        char ch;
+#endif
+        char *cp;
+        struct bi_record *rec;
+        unsigned long initrd_loc = 0, TotalMemory = 0;
+
+#if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
+        com_port = serial_init(0, NULL);
+#endif
+
+#if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
+        /* Reset MAL */
+        mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
+        /* Wait for reset */
+        while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
+        /* Reset EMAC */
+        *(volatile unsigned long *)PPC44x_EMAC0_MR0 = 0x20000000;
+        __asm__ __volatile__("eieio");
+#endif
+
+        /*
+         * Call get_mem_size(), which is memory controller dependent,
+         * and we must have the correct file linked in here.
+         */
+        TotalMemory = get_mem_size();
+
+        /* assume the chunk below 8M is free */
+        end_avail = (char *)0x00800000;
+
+        /*
+         * Reveal where we were loaded at and where we
+         * were relocated to.
+         */
+        puts("loaded at:     "); puthex(load_addr);
+        puts(" "); puthex((unsigned long)(load_addr + (4*num_words)));
+        puts("\n");
+        if ( (unsigned long)load_addr != (unsigned long)&start )
+        {
+                puts("relocated to:  "); puthex((unsigned long)&start);
+                puts(" ");
+                puthex((unsigned long)((unsigned long)&start + (4*num_words)));
+                puts("\n");
+        }
+
+        /*
+         * We link ourself to 0x00800000.  When we run, we relocate
+         * ourselves there.  So we just need __image_begin for the
+         * start. -- Tom
+         */
+        zimage_start = (char *)(unsigned long)(&__image_begin);
+        zimage_size = (unsigned long)(&__image_end) -
+                        (unsigned long)(&__image_begin);
+
+        initrd_size = (unsigned long)(&__ramdisk_end) -
+                (unsigned long)(&__ramdisk_begin);
+
+        /*
+         * The zImage and initrd will be between start and _end, so they've
+         * already been moved once.  We're good to go now. -- Tom
+         */
+        avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
+        puts("zimage at:     "); puthex((unsigned long)zimage_start);
+        puts(" "); puthex((unsigned long)(zimage_size+zimage_start));
+        puts("\n");
+
+        if ( initrd_size ) {
+                puts("initrd at:     ");
+                puthex((unsigned long)(&__ramdisk_begin));
+                puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
+        }
+
+        avail_ram = (char *)0x00400000;
+        end_avail = (char *)0x00800000;
+        puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
+        puthex((unsigned long)end_avail); puts("\n");
+
+        if (keyb_present)
+                CRT_tstc();  /* Forces keyboard to be initialized */
+#ifdef CONFIG_GEMINI
+        /*
+         * If cmd_line is empty and cmd_preset is not, copy cmd_preset
+         * to cmd_line.  This way we can override cmd_preset with the
+         * command line from Smon.
+         */
+
+        if ( (cmd_line[0] == '\0') && (cmd_preset[0] != '\0'))
+                memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
+#endif
+
+        /* Display standard Linux/PPC boot prompt for kernel args */
+        puts("\nLinux/PPC load: ");
+        cp = cmd_line;
+        memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
+        while ( *cp ) putc(*cp++);
+
+#ifdef INTERACTIVE_CONSOLE
+        /*
+         * If they have a console, allow them to edit the command line.
+         * Otherwise, don't bother wasting the five seconds.
+         */
+        while (timer++ < 5*1000) {
+                if (tstc()) {
+                        while ((ch = getc()) != '\n' && ch != '\r') {
+                                /* Test for backspace/delete */
+                                if (ch == '\b' || ch == '\177') {
+                                        if (cp != cmd_line) {
+                                                cp--;
+                                                puts("\b \b");
+                                        }
+                                /* Test for ^x/^u (and wipe the line) */
+                                } else if (ch == '\030' || ch == '\025') {
+                                        while (cp != cmd_line) {
+                                                cp--;
+                                                puts("\b \b");
+                                        }
+                                } else {
+                                        *cp++ = ch;
+                                        putc(ch);
+                                }
+                        }
+                        break;  /* Exit 'timer' loop */
+                }
+                udelay(1000);  /* 1 msec */
+        }
+        *cp = 0;
+#endif
+        puts("\n");
+
+        puts("Uncompressing Linux...");
+        gunzip(0x0, 0x400000, zimage_start, &zimage_size);
+        puts("done.\n");
+
+        /* get the bi_rec address */
+        rec = bootinfo_addr(zimage_size);
+
+        /* We need to make sure that the initrd and bi_recs do not
+         * overlap. */
+        if ( initrd_size ) {
+                unsigned long rec_loc = (unsigned long) rec;
+                initrd_loc = (unsigned long)(&__ramdisk_begin);
+                /* If the bi_recs are in the middle of the current
+                 * initrd, move the initrd to the next MB
+                 * boundary. */
+                if ((rec_loc > initrd_loc) &&
+                                ((initrd_loc + initrd_size) > rec_loc)) {
+                        initrd_loc = _ALIGN((unsigned long)(zimage_size)
+                                        + (2 << 20) - 1, (2 << 20));
+                        memmove((void *)initrd_loc, &__ramdisk_begin,
+                                 initrd_size);
+                        puts("initrd moved:  "); puthex(initrd_loc);
+                        puts(" "); puthex(initrd_loc + initrd_size);
+                        puts("\n");
+                }
+        }
+
+        bootinfo_init(rec);
+        if ( TotalMemory )
+                bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
+
+        bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
+
+        /* add a bi_rec for the initrd if it exists */
+        if (initrd_size) {
+                unsigned long initrd[2];
+
+                initrd[0] = initrd_loc;
+                initrd[1] = initrd_size;
+
+                bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
+        }
+        puts("Now booting the kernel\n");
+        serial_close(com_port);
+
+        return rec;
+}
+
+void __attribute__ ((weak))
+board_isa_init(void)
+{
+}
+
+/* Allow decompress_kernel to be hooked into.  This is the default. */
+void * __attribute__ ((weak))
+load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
+                void *ign1, void *ign2)
+{
+                board_isa_init();
+                return decompress_kernel(load_addr, num_words, cksum);
+}