--- /dev/null
+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ * IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#include <stdint.h>
+#include <xvect.h>
+#include <hw.h>
+#include <stdio.h>
+#include <romfs.h>
+#include "memmap.h"
+#include "stage2.h"
+#include <termctrl.h>
+#include "product.h"
+#include "calculatecrc.h"
+#include <cpu.h>
+#include <libelf.h>
+#include <string.h>
+
+uint64_t uart;
+uint64_t gVecNum;
+uint8_t u4Flag;
+
+uint64_t exception_stack_frame;
+
+typedef void (*pInterruptFunc_t) (void);
+
+pInterruptFunc_t vectorTable[0x2E << 1];
+
+extern void proceedInterrupt(void);
+
+/* Prototypes for functions in this file: */
+void c_interrupt(uint64_t vecNum);
+void set_exceptionVector(int num, void *func);
+int io_getchar(char *ch);
+void early_c_entry(uint64_t start_addr);
+
+
+static void
+exception_forward(void)
+{
+ uint64_t val;
+
+ if (*(uint64_t *) XVECT_M_HANDLER) {
+ proceedInterrupt();
+ }
+
+ printf("\r\n exception %llx ", gVecNum);
+ asm volatile ("mfsrr0 %0":"=r" (val):);
+ printf("\r\nSRR0 = %08llx%08llx ", val >> 32, val);
+ asm volatile ("mfsrr1 %0":"=r" (val):);
+ printf(" SRR1 = %08llx%08llx ", val >> 32, val);
+
+ asm volatile ("mfsprg %0,2":"=r" (val):);
+ printf("\r\nSPRG2 = %08llx%08llx ", val >> 32, val);
+ asm volatile ("mfsprg %0,3":"=r" (val):);
+ printf(" SPRG3 = %08llx%08llx \r\n", val >> 32, val);
+ while (1);
+}
+
+void
+c_interrupt(uint64_t vecNum)
+{
+ gVecNum = vecNum;
+ if (vectorTable[vecNum >> 7]) {
+ vectorTable[vecNum >> 7] ();
+ } else {
+ exception_forward();
+ }
+}
+
+void
+set_exceptionVector(int num, void *func)
+{
+ vectorTable[num >> 7] = (pInterruptFunc_t) func;
+}
+
+static void
+io_init(void)
+{
+ // read ID register: only if it is a PC87427, enable serial2
+ store8_ci(0xf400002e, 0x20);
+ if (load8_ci(0xf400002f) != 0xf2) {
+ uart = 0xf40003f8;
+ u4Flag = 0;
+ } else {
+ uart = 0xf40002f8;
+ u4Flag = 1;
+ }
+}
+
+int
+io_getchar(char *ch)
+{
+ int retVal = 0;
+ if ((load8_ci(uart + 5) & 0x01)) {
+ *ch = load8_ci(uart);
+ retVal = 1;
+ }
+ return retVal;
+}
+
+
+void copy_from_flash(uint64_t cnt, uint64_t src, uint64_t dest);
+
+const uint32_t CrcTableHigh[16] = {
+ 0x00000000, 0x4C11DB70, 0x9823B6E0, 0xD4326D90,
+ 0x34867077, 0x7897AB07, 0xACA5C697, 0xE0B41DE7,
+ 0x690CE0EE, 0x251D3B9E, 0xF12F560E, 0xBD3E8D7E,
+ 0x5D8A9099, 0x119B4BE9, 0xC5A92679, 0x89B8FD09
+};
+const uint32_t CrcTableLow[16] = {
+ 0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9,
+ 0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005,
+ 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61,
+ 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD
+};
+
+static unsigned long
+check_flash_image(unsigned long rombase, unsigned long length,
+ unsigned long start_crc)
+{
+
+ uint32_t AccumCRC = start_crc;
+ char val;
+ uint32_t Temp;
+ while (length-- > 0) {
+ val = load8_ci(rombase++);
+ Temp = ((AccumCRC >> 24) ^ val) & 0x000000ff;
+ AccumCRC <<= 8;
+ AccumCRC ^= CrcTableHigh[Temp / 16];
+ AccumCRC ^= CrcTableLow[Temp % 16];
+ }
+
+ return AccumCRC;
+}
+
+static void
+load_file(uint64_t destAddr, char *name, uint64_t maxSize, uint64_t romfs_base)
+{
+ uint64_t *src, *dest, cnt;
+ struct romfs_lookup_t fileInfo;
+ c_romfs_lookup(name, romfs_base, &fileInfo);
+ if (maxSize) {
+ cnt = maxSize / 8;
+ } else {
+ cnt = (fileInfo.size_data + 7) / 8;
+ }
+ dest = (uint64_t *) destAddr;
+ src = (uint64_t *) fileInfo.addr_data;
+ while (cnt--) {
+ store64_ci((uint64_t) dest, *src);
+ dest++;
+ src++;
+ }
+ flush_cache((void *) destAddr, fileInfo.size_data);
+}
+
+/***************************************************************************
+ * Function: early_c_entry
+ * Input : start_addr
+ *
+ * Description:
+ **************************************************************************/
+void
+early_c_entry(uint64_t start_addr)
+{
+ struct romfs_lookup_t fileInfo;
+ uint32_t crc;
+ void (*ofw_start) (uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
+ uint64_t *boot_info;
+ exception_stack_frame = 0;
+ /* destination for the flash image; we copy it to RAM
+ * because from flash it is much too slow
+ * the flash is copied at 224MB - 4MB (max flash size)
+ * at 224MB starts SLOF
+ * at 256MB is the SLOF load-base */
+ uint64_t romfs_base = 0xe000000 - 0x400000;
+ // romfs header values
+ struct stH *header = (struct stH *) (start_addr + 0x28);
+ //since we cannot read the fh_magic directly from flash as a string, we need to copy it to memory
+ uint64_t magic_val = 0;
+ uint64_t startVal = 0;
+ uint64_t flashlen = 0;
+ unsigned long ofw_addr;
+
+ io_init();
+
+ flashlen = load64_ci((uint64_t) (&header->flashlen));
+
+ //copy fh_magic to magic_val since, we cannot use it as a string from flash
+ magic_val = load64_ci((uint64_t) (header->magic));
+
+ printf(" Check ROM = ");
+ if (strncmp((char *) &magic_val, FLASHFS_MAGIC, 8) == 0) {
+ // somehow, the first 8 bytes in flashfs are overwritten, if booting from drone...
+ // so if we find "IMG1" in the first 4 bytes, we skip the CRC check...
+ startVal = load64_ci((uint64_t) start_addr);
+ if (strncmp((char *) &startVal, "IMG1", 4) == 0) {
+ printf
+ ("start from RAM detected, skipping CRC check!\r\n");
+ // for romfs accesses (c_romfs_lookup) to work, we must fix the first uint64_t to the value we expect...
+ store64_ci((uint64_t) start_addr, 0xd8);
+ } else {
+ //checking CRC in flash, we must use cache_inhibit
+ // since the crc is included as the last 32 bits in the image, the resulting crc should be 0
+ crc =
+ check_flash_image((uint64_t) start_addr,
+ load64_ci((uint64_t)
+ (&header->flashlen)),
+ 0);
+ if (crc == 0) {
+ printf("OK\r\n");
+ } else {
+ printf("failed!\r\n");
+ while (1);
+ }
+ }
+ } else {
+ printf
+ ("failed (magic string is \"%.8s\" should be \"%.8s\")\r\n",
+ (char *) &magic_val, FLASHFS_MAGIC);
+ while (1);
+ }
+
+ printf(" Press \"s\" to enter Open Firmware.\r\n\r\n");
+
+ if ((start_addr > 0xF0000000) && u4Flag)
+ u4memInit();
+
+ /* here we have real ram avail -> hopefully
+ * copy flash to ram; size is in 64 byte blocks */
+ flashlen /= 64;
+ /* align it a bit */
+ flashlen += 7;
+ flashlen &= ~7;
+ copy_from_flash(flashlen, start_addr, romfs_base);
+ /* takeover sometimes fails if the image running on the system
+ * has a different size; flushing the cache helps, because it is
+ * the right thing to do anyway */
+ flush_cache((void *) romfs_base, flashlen * 64);
+
+ c_romfs_lookup("bootinfo", romfs_base, &fileInfo);
+ boot_info = (uint64_t *) fileInfo.addr_data;
+ boot_info[1] = start_addr;
+ load_file(0x100, "xvect", 0, romfs_base);
+ load_file(SLAVELOOP_LOADBASE, "stageS", 0, romfs_base);
+ c_romfs_lookup("ofw_main", romfs_base, &fileInfo);
+
+ elf_load_file((void *) fileInfo.addr_data, &ofw_addr,
+ NULL, flush_cache);
+ ofw_start =
+ (void (*)(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t))
+ &ofw_addr;
+ // re-enable the cursor
+ printf("%s%s", TERM_CTRL_RESET, TERM_CTRL_CRSON);
+ /* ePAPR 0.5
+ * r3 = R3 Effective address of the device tree image. Note: this
+ * address must be 8-byte aligned in memory.
+ * r4 = implementation dependent
+ * r5 = 0
+ * r6 = 0x65504150 -- ePAPR magic value-to distinguish from
+ * non-ePAPR-compliant firmware
+ * r7 = implementation dependent
+ */
+ asm volatile("isync; sync;" : : : "memory");
+ ofw_start(0, romfs_base, 0, 0, 0);
+ // never return
+}
Code Review / kvmfornfv.git / blobdiff