[PATCH] powerpc: Add back support for booting from BootX (#2)
ARCH=powerpc couldn't boot from BootX as it uses a "different" way of
getting in the kernel. This patch adds the necessary trampolines,
creating a flattened device-tree from the tree passed from MacOS, and
initializing the btext engine early for really-early debugging.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/include/asm-powerpc/bootx.h b/include/asm-powerpc/bootx.h
new file mode 100644
index 0000000..ed626b7
--- /dev/null
+++ b/include/asm-powerpc/bootx.h
@@ -0,0 +1,166 @@
+/*
+ * This file describes the structure passed from the BootX application
+ * (for MacOS) when it is used to boot Linux.
+ *
+ * Written by Benjamin Herrenschmidt.
+ */
+
+
+#ifndef __ASM_BOOTX_H__
+#define __ASM_BOOTX_H__
+
+#ifdef macintosh
+#include <Types.h>
+#include "linux_type_defs.h"
+#endif
+
+#ifdef macintosh
+/* All this requires PowerPC alignment */
+#pragma options align=power
+#endif
+
+/* On kernel entry:
+ *
+ * r3 = 0x426f6f58 ('BooX')
+ * r4 = pointer to boot_infos
+ * r5 = NULL
+ *
+ * Data and instruction translation disabled, interrupts
+ * disabled, kernel loaded at physical 0x00000000 on PCI
+ * machines (will be different on NuBus).
+ */
+
+#define BOOT_INFO_VERSION 5
+#define BOOT_INFO_COMPATIBLE_VERSION 1
+
+/* Bit in the architecture flag mask. More to be defined in
+ future versions. Note that either BOOT_ARCH_PCI or
+ BOOT_ARCH_NUBUS is set. The other BOOT_ARCH_NUBUS_xxx are
+ set additionally when BOOT_ARCH_NUBUS is set.
+ */
+#define BOOT_ARCH_PCI 0x00000001UL
+#define BOOT_ARCH_NUBUS 0x00000002UL
+#define BOOT_ARCH_NUBUS_PDM 0x00000010UL
+#define BOOT_ARCH_NUBUS_PERFORMA 0x00000020UL
+#define BOOT_ARCH_NUBUS_POWERBOOK 0x00000040UL
+
+/* Maximum number of ranges in phys memory map */
+#define MAX_MEM_MAP_SIZE 26
+
+/* This is the format of an element in the physical memory map. Note that
+ the map is optional and current BootX will only build it for pre-PCI
+ machines */
+typedef struct boot_info_map_entry
+{
+ __u32 physAddr; /* Physical starting address */
+ __u32 size; /* Size in bytes */
+} boot_info_map_entry_t;
+
+
+/* Here are the boot informations that are passed to the bootstrap
+ * Note that the kernel arguments and the device tree are appended
+ * at the end of this structure. */
+typedef struct boot_infos
+{
+ /* Version of this structure */
+ __u32 version;
+ /* backward compatible down to version: */
+ __u32 compatible_version;
+
+ /* NEW (vers. 2) this holds the current _logical_ base addr of
+ the frame buffer (for use by early boot message) */
+ __u8* logicalDisplayBase;
+
+ /* NEW (vers. 4) Apple's machine identification */
+ __u32 machineID;
+
+ /* NEW (vers. 4) Detected hw architecture */
+ __u32 architecture;
+
+ /* The device tree (internal addresses relative to the beginning of the tree,
+ * device tree offset relative to the beginning of this structure).
+ * On pre-PCI macintosh (BOOT_ARCH_PCI bit set to 0 in architecture), this
+ * field is 0.
+ */
+ __u32 deviceTreeOffset; /* Device tree offset */
+ __u32 deviceTreeSize; /* Size of the device tree */
+
+ /* Some infos about the current MacOS display */
+ __u32 dispDeviceRect[4]; /* left,top,right,bottom */
+ __u32 dispDeviceDepth; /* (8, 16 or 32) */
+ __u8* dispDeviceBase; /* base address (physical) */
+ __u32 dispDeviceRowBytes; /* rowbytes (in bytes) */
+ __u32 dispDeviceColorsOffset; /* Colormap (8 bits only) or 0 (*) */
+ /* Optional offset in the registry to the current
+ * MacOS display. (Can be 0 when not detected) */
+ __u32 dispDeviceRegEntryOffset;
+
+ /* Optional pointer to boot ramdisk (offset from this structure) */
+ __u32 ramDisk;
+ __u32 ramDiskSize; /* size of ramdisk image */
+
+ /* Kernel command line arguments (offset from this structure) */
+ __u32 kernelParamsOffset;
+
+ /* ALL BELOW NEW (vers. 4) */
+
+ /* This defines the physical memory. Valid with BOOT_ARCH_NUBUS flag
+ (non-PCI) only. On PCI, memory is contiguous and it's size is in the
+ device-tree. */
+ boot_info_map_entry_t
+ physMemoryMap[MAX_MEM_MAP_SIZE]; /* Where the phys memory is */
+ __u32 physMemoryMapSize; /* How many entries in map */
+
+
+ /* The framebuffer size (optional, currently 0) */
+ __u32 frameBufferSize; /* Represents a max size, can be 0. */
+
+ /* NEW (vers. 5) */
+
+ /* Total params size (args + colormap + device tree + ramdisk) */
+ __u32 totalParamsSize;
+
+} boot_infos_t;
+
+/* (*) The format of the colormap is 256 * 3 * 2 bytes. Each color index
+ * is represented by 3 short words containing a 16 bits (unsigned) color
+ * component. Later versions may contain the gamma table for direct-color
+ * devices here.
+ */
+#define BOOTX_COLORTABLE_SIZE (256UL*3UL*2UL)
+
+/* BootX passes the device-tree using a format that comes from earlier
+ * ppc32 kernels. This used to match what is in prom.h, but not anymore
+ * so we now define it here
+ */
+struct bootx_dt_prop {
+ u32 name;
+ int length;
+ u32 value;
+ u32 next;
+};
+
+struct bootx_dt_node {
+ u32 unused0;
+ u32 unused1;
+ u32 phandle; /* not really available */
+ u32 unused2;
+ u32 unused3;
+ u32 unused4;
+ u32 unused5;
+ u32 full_name;
+ u32 properties;
+ u32 parent;
+ u32 child;
+ u32 sibling;
+ u32 next;
+ u32 allnext;
+};
+
+extern void bootx_init(unsigned long r4, unsigned long phys);
+
+#ifdef macintosh
+#pragma options align=reset
+#endif
+
+#endif