From 9e80202352dd49bdd9e67b8b906d86f058431505 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <tpearson@raptorengineering.com>
Date: Sat, 11 May 2019 15:12:49 -0500
Subject: Initial import of abandoned HQEMU version 2.5.2

---
 src/roms/openbios/arch/ppc/briq/main.c | 145 +++++++++++++++++++++++++++++++++
 1 file changed, 145 insertions(+)
 create mode 100644 src/roms/openbios/arch/ppc/briq/main.c

(limited to 'src/roms/openbios/arch/ppc/briq/main.c')

diff --git a/src/roms/openbios/arch/ppc/briq/main.c b/src/roms/openbios/arch/ppc/briq/main.c
new file mode 100644
index 0000000..fbb2a26
--- /dev/null
+++ b/src/roms/openbios/arch/ppc/briq/main.c
@@ -0,0 +1,145 @@
+/*
+ *   Creation Date: <2004/08/28 18:38:22 greg>
+ *   Time-stamp: <2004/08/28 18:38:22 greg>
+ *
+ *	<main.c>
+ *
+ *   Copyright (C) 2004 Greg Watson
+ *
+ *   Based on MOL specific code which is
+ *   Copyright (C) 2002, 2003, 2004 Samuel Rydh (samuel@ibrium.se)
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation
+ *
+ */
+
+
+#include "config.h"
+#include "libopenbios/bindings.h"
+#include "libopenbios/elfload.h"
+#include "arch/common/nvram.h"
+#include "libc/diskio.h"
+#include "libc/vsprintf.h"
+#include "briq/briq.h"
+#include "libopenbios/ofmem.h"
+
+static void
+transfer_control_to_elf( unsigned long entry )
+{
+	extern void call_elf( unsigned long entry );
+	printk("Starting ELF image at 0x%08lX\n", entry);
+	call_elf( 0x400000 );
+	//call_elf( entry );
+
+	fatal_error("call_elf returned unexpectedly\n");
+}
+
+static int
+load_elf_rom( unsigned long *entry, int fd )
+{
+	int i, lszz_offs, elf_offs;
+	char buf[128], *addr;
+	Elf_ehdr ehdr;
+	Elf_phdr *phdr;
+	size_t s;
+
+	printk("Loading '%s'\n", get_file_path(fd));
+
+	/* the ELF-image (usually) starts at offset 0x4000 */
+	if( (elf_offs=find_elf(fd)) < 0 ) {
+		printk("----> %s is not an ELF image\n", buf );
+		exit(1);
+	}
+	if( !(phdr=elf_readhdrs(fd, elf_offs, &ehdr)) )
+		fatal_error("elf_readhdrs failed\n");
+
+	*entry = ehdr.e_entry;
+
+	/* load segments. Compressed ROM-image assumed to be located immediately
+	 * after the last segment */
+	lszz_offs = elf_offs;
+	for( i=0; i<ehdr.e_phnum; i++ ) {
+		/* p_memsz, p_flags */
+		s = MIN( phdr[i].p_filesz, phdr[i].p_memsz );
+		seek_io( fd, elf_offs + phdr[i].p_offset );
+
+		/* printk("filesz: %08lX memsz: %08lX p_offset: %08lX p_vaddr %08lX\n",
+		   phdr[i].p_filesz, phdr[i].p_memsz, phdr[i].p_offset,
+		   phdr[i].p_vaddr ); */
+
+		if( phdr[i].p_vaddr != phdr[i].p_paddr )
+			printk("WARNING: ELF segment virtual addr != physical addr\n");
+		lszz_offs = MAX( lszz_offs, elf_offs + phdr[i].p_offset + phdr[i].p_filesz );
+		if( !s )
+			continue;
+		if( ofmem_claim( phdr[i].p_vaddr, phdr[i].p_memsz, 0 ) == -1 )
+			fatal_error("Claim failed!\n");
+
+		addr = (char*)phdr[i].p_vaddr;
+		if( read_io(fd, addr, s) != s )
+			fatal_error("read failed\n");
+
+#if 0
+		/* patch CODE segment */
+		if( *entry >= phdr[i].p_vaddr && *entry < phdr[i].p_vaddr + s ) {
+			patch_newworld_rom( (char*)phdr[i].p_vaddr, s );
+			newworld_timer_hack( (char*)phdr[i].p_vaddr, s );
+		}
+#endif
+		flush_icache_range( addr, addr+s );
+
+		/*printk("ELF ROM-section loaded at %08lX (size %08lX)\n",
+		   (unsigned long)phdr[i].p_vaddr, (unsigned long)phdr[i].p_memsz );*/
+	}
+	free( phdr );
+	return lszz_offs;
+}
+
+
+static void
+encode_bootpath( const char *spec, const char *args )
+{
+	phandle_t chosen_ph = find_dev("/chosen");
+	set_property( chosen_ph, "bootpath", spec, strlen(spec)+1 );
+	set_property( chosen_ph, "bootargs", args, strlen(args)+1 );
+}
+
+/************************************************************************/
+/*	briq booting							*/
+/************************************************************************/
+
+static void
+briq_startup( void )
+{
+	const char *paths[] = { "hd:0,\\zImage.chrp", NULL };
+	const char *args[] = { "root=/dev/hda2 console=ttyS0,115200", NULL };
+	unsigned long entry;
+	int i, fd;
+
+	for( i=0; paths[i]; i++ ) {
+		if( (fd=open_io(paths[i])) == -1 )
+			continue;
+		(void) load_elf_rom( &entry, fd );
+		close_io( fd );
+		encode_bootpath( paths[i], args[i] );
+
+		update_nvram();
+		transfer_control_to_elf( entry );
+		/* won't come here */
+	}
+	printk("*** Boot failure! No secondary bootloader specified ***\n");
+}
+
+
+/************************************************************************/
+/*	entry								*/
+/************************************************************************/
+
+void
+boot( void )
+{
+	fword("update-chosen");
+	briq_startup();
+}
-- 
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