IPC to boot in-mem PPC ELF, with some test code.

boot2.h

@@ -1,8 +1,10 @@
 #ifndef __BOOT2_H__
 #define __BOOT2_H__
 
-void boot2_ipc(volatile ipc_request *req);
+#include "ipc.h"
+
 int boot2_run(u32 tid_hi, u32 tid_lo);
 void boot2_init();
+void boot2_ipc(volatile ipc_request *req);
 
 #endif

ipc.c

@@ -10,6 +10,7 @@
 #include "sdhc.h"
 #include "crypto.h"
 #include "boot2.h"
+#include "powerpc.h"
 #include "panic.h"
 
 static volatile ipc_request in_queue[IPC_IN_SIZE] ALIGNED(32) MEM2_BSS;
@@ -136,6 +137,9 @@ static int process_slow(volatile ipc_request *req)
 			boot2_ipc(req);
 			return 0;
 			break;
+		case IPC_DEV_PPC:
+			powerpc_ipc(req);
+			break;
 		default:
 			gecko_printf("IPC: unknown SLOW request %02x-%04x\n", req->device, req->req);
 	}

ipc.h

@@ -12,6 +12,7 @@
 #define IPC_DEV_KEYS	0x03
 #define IPC_DEV_AES	0x04
 #define IPC_DEV_BOOT2	0x05
+#define IPC_DEV_PPC	0x06
 
 #define IPC_SYS_PING	0x0000
 #define IPC_SYS_JUMP	0x0001
@@ -56,6 +57,8 @@
 
 #define IPC_BOOT2_RUN	0x0000
 
+#define IPC_PPC_BOOT	0x0000
+
 #define IPC_CODE (f,d,r) (((f)<<24)|((d)<<16)|(r))
 
 #define IPC_IN_SIZE		32

main.c

@@ -222,7 +222,7 @@ void *_main(void *base)
 
 	gecko_printf("Trying to boot:" PPC_BOOT_FILE "\n");
 
-	res = powerpc_load_file(PPC_BOOT_FILE);
+	res = powerpc_boot_file(PPC_BOOT_FILE);
 	if(res < 0) {
 		gecko_printf("Failed to boot PPC: %d\n", res);
 		gecko_printf("Continuing anyway\n");

powerpc.c

@@ -20,7 +20,9 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 */
 #include "types.h"
+#include "memory.h"
 #include "powerpc.h"
+#include "powerpc_elf.h"
 #include "hollywood.h"
 #include "utils.h"
 #include "start.h"
@@ -73,3 +75,18 @@ void powerpc_reset()
 	udelay(100000);
 	set32(HW_EXICTRL, EXICTRL_ENABLE_EXI);
 }
+
+void powerpc_ipc(volatile ipc_request *req)
+{
+	switch (req->req) {
+		case IPC_PPC_BOOT:
+			dc_invalidaterange((void *) req->args[0], (u32) req->args[1]);
+			int res = powerpc_boot_mem((u8 *) req->args[0], (u32) req->args[1]);
+			if (res)
+				ipc_post(req->code, req->tag, 1, res);
+			break;
+		default:
+			gecko_printf("IPC: unknown SLOW PPC request %04X\n", req->req);
+	}
+}
+

powerpc.h

@@ -1,9 +1,12 @@
 #ifndef	__POWERPC_H__
 #define	__POWERPC_H__	1
 
-void ppc_boot_code();
+#include "ipc.h"
+
 void powerpc_upload_stub(u32 entry);
 void powerpc_hang();
 void powerpc_reset();
+void powerpc_ipc(volatile ipc_request *req);
 
 #endif
+

powerpc_elf.c

@@ -16,7 +16,7 @@ static Elf32_Ehdr elfhdr;
 static Elf32_Phdr phdrs[PHDR_MAX];
 static FIL fd;
 
-int powerpc_load_file(const char *path)
+int powerpc_boot_file(const char *path)
 {
 	u32 read;
 	FRESULT fres;
@@ -90,3 +90,61 @@ int powerpc_load_file(const char *path)
 
 	return 0;
 }
+
+int powerpc_boot_mem(const u8 *addr, u32 len)
+{
+	if (len < sizeof(Elf32_Ehdr))
+		return -100;
+
+	Elf32_Ehdr *ehdr = (Elf32_Ehdr *) addr;
+
+	if (memcmp("\x7F" "ELF\x01\x02\x01\x00\x00", ehdr->e_ident, 9)) {
+		gecko_printf("Invalid ELF header! 0x%02x 0x%02x 0x%02x 0x%02x\n",
+						ehdr->e_ident[0], ehdr->e_ident[1],
+						ehdr->e_ident[2], ehdr->e_ident[3]);
+		return -101;
+	}
+
+	if (ehdr->e_phoff == 0 || ehdr->e_phnum == 0) {
+		gecko_printf("ELF has no program headers!\n");
+		return -102;
+	}
+
+	if (ehdr->e_phnum > PHDR_MAX) {
+		gecko_printf("ELF has too many (%d) program headers!\n",
+						elfhdr.e_phnum);
+		return -102;
+	}
+
+	int count = ehdr->e_phnum;
+	if (len < ehdr->e_phoff + count * sizeof(Elf32_Phdr))
+		return -103;
+
+	Elf32_Phdr *phdr = (Elf32_Phdr *) &addr[ehdr->e_phoff];
+
+	// TODO: add more checks here
+	// - phdrs out of bounds?
+	// - loaded ELF overwrites itself?
+
+	powerpc_hang();
+
+	while (count--) {
+		if (phdr->p_type != PT_LOAD) {
+			gecko_printf("Skipping PHDR of type %d\n", phdr->p_type);
+		} else {
+			gecko_printf("LOAD 0x%x -> %p [0x%x]\n", phdr->p_offset, phdr->p_paddr, phdr->p_filesz);
+			memcpy((void *) phdr->p_paddr, &addr[phdr->p_offset],
+					phdr->p_filesz);
+		}
+		phdr++;
+	}
+
+	dc_flushall();
+
+	gecko_printf("ELF load done, booting PPC...\n");
+	powerpc_upload_stub(ehdr->e_entry);
+	powerpc_reset();
+	gecko_printf("PPC booted!\n");
+
+	return 0;
+}

powerpc_elf.h

@@ -1,6 +1,7 @@
-#ifndef	__POWERPC_H__
-#define	__POWERPC_H__	1
+#ifndef	__POWERPC_ELF_H__
+#define	__POWERPC_ELF_H__	1
 
-int powerpc_load_file(const char *path);
+int powerpc_boot_file(const char *path);
+int powerpc_boot_mem(const u8 *addr, u32 len);
 
 #endif