gdrom_jvm_boot: jump to _start

common.mk

@@ -60,7 +60,8 @@ sine.pcm: common.mk
 		/=./pcm/PRELUDE.PCM \
 		/=./pcm/CLOCKTOW.PCM \
 		/=./pcm/ELEC.PCM \
-		/=./pcm/ECCLESIA.PCM
+		/=./pcm/ECCLESIA.PCM \
+		/=jvm.bin
 
 clean:
 	find -P \

crc_main.c

@@ -0,0 +1,73 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <inttypes.h>
+
+#include "crc32.c"
+
+int read_file(const char * filename, uint8_t ** buf, uint32_t * size_out)
+{
+  FILE * file = fopen(filename, "rb");
+  if (file == NULL) {
+    fprintf(stderr, "fopen(\"%s\", \"rb\"): %s\n", filename, strerror(errno));
+    return -1;
+  }
+
+  int ret;
+  ret = fseek(file, 0L, SEEK_END);
+  if (ret < 0) {
+    fprintf(stderr, "fseek(SEEK_END)");
+    return -1;
+  }
+
+  long offset = ftell(file);
+  if (offset < 0) {
+    fprintf(stderr, "ftell");
+    return -1;
+  }
+  size_t size = offset;
+
+  ret = fseek(file, 0L, SEEK_SET);
+  if (ret < 0) {
+    fprintf(stderr, "fseek(SEEK_SET)");
+    return -1;
+  }
+
+  fprintf(stderr, "read_file: %s size %ld\n", filename, size);
+  *buf = (uint8_t *)malloc(size);
+  size_t fread_size = fread(*buf, 1, size, file);
+  if (fread_size != size) {
+    fprintf(stderr, "fread `%s` short read: %" PRIu64 " ; expected: %" PRIu64 "\n", filename, fread_size, size);
+    return -1;
+  }
+
+  ret = fclose(file);
+  if (ret < 0) {
+    fprintf(stderr, "fclose");
+    return -1;
+  }
+
+  *size_out = size;
+
+  return 0;
+}
+
+int main(int argc, char * argv[])
+{
+  assert(argc == 2);
+
+  uint8_t * buf;
+  uint32_t size;
+  int ret = read_file(argv[1], &buf, &size);
+  assert(ret == 0);
+
+  printf("size: %08x\n", size);
+  int chunks = size / 2048;
+  printf("crc:\n");
+  for (int i = 0; i < chunks; i++) {
+    uint32_t crc = crc32(&buf[i * 2048], 2048);
+    printf("0x%08x\n", crc);
+  }
+}

example/gdrom_jvm_boot.cpp

@@ -7,10 +7,15 @@
 #include "gdrom/gdrom_bits.hpp"
 #include "gdrom/command_packet_format.hpp"
 #include "gdrom/toc.hpp"
+#include "holly/video_output.hpp"
 
 #include "iso9660/primary_volume_descriptor.hpp"
 #include "iso9660/directory_record.hpp"
 
+#include "crc32.h"
+
+typedef void (*main_ptr_t)(void);
+
 void pio_data(const uint8_t * data)
 {
   while ((gdrom::status::bsy(gdrom_if.status) | gdrom::status::drq(gdrom_if.status)) != 0);
@@ -32,9 +37,9 @@ void pio_data(const uint8_t * data)
 
 void read_data(uint16_t * buf, const uint32_t length)
 {
-  serial::string("read_data drq interrupt_reason: ");
+  //serial::string("read_data drq interrupt_reason: ");
-  serial::integer<uint8_t>(gdrom::status::drq(gdrom_if.status), ' ');
+  //serial::integer<uint8_t>(gdrom::status::drq(gdrom_if.status), ' ');
-  serial::integer<uint8_t>(gdrom_if.interrupt_reason);
+  //serial::integer<uint8_t>(gdrom_if.interrupt_reason);
   for (uint32_t i = 0; i < (length / 2); i++) {
     buf[i] = gdrom_if.data;
   }
@@ -110,6 +115,72 @@ bool dr_is_self_or_parent(const iso9660::directory_record * dr)
 
 #define FILE_FLAGS__DIRECTORY 2
 
+bool is_jvm_bin(const uint8_t * file_identifier, int length_of_file_identifier)
+{
+  static const uint8_t * jvm_bin = (const uint8_t *)"JVM.BIN;1";
+  int jvm_bin_length = 9;
+  if (length_of_file_identifier != jvm_bin_length)
+    return false;
+
+  for (int i = 0; i < jvm_bin_length; i++) {
+    if (file_identifier[i] != jvm_bin[i])
+      return false;
+  }
+  return true;
+}
+
+static inline int min(int a, int b)
+{
+  return a < b ? a : b;
+}
+
+static bool jvm_load_complete;
+static int __data_length;
+constexpr int load_address = 0xac010000;
+
+void load_jvm_bin(const iso9660::directory_record * dr)
+{
+  serial::string("load jvm bin:\n");
+  //__attribute__((aligned(4))) static uint16_t file_buf16[16384 / 2];
+  //uint32_t * file_buf32 = reinterpret_cast<uint32_t *>(file_buf16);
+  uint16_t * load_buf = reinterpret_cast<uint16_t *>(load_address);
+  int offset = 0;
+
+  int extent = dr->location_of_extent.get();
+  int data_length = dr->data_length.get();
+  serial::integer<uint32_t>(extent);
+
+  int transfers = 0;
+  while (data_length > 0) {
+    int transfer_size = min(data_length, 2048);
+    int sectors = transfer_size >> 11; // divide by 2048
+    if (sectors == 0)
+      sectors = 1;
+
+    cd_read(&load_buf[offset],
+            extent + 150, // 150?
+            sectors // one sector
+            );
+
+    offset += transfer_size / (sizeof (load_buf[0]));
+
+    extent += sectors;
+    data_length -= sectors * 2048;
+    transfers += 1;
+  }
+
+  serial::string("\njvm load complete\n");
+  jvm_load_complete = true;
+  serial::integer<uint32_t>(extent);
+
+  serial::string("size: ");
+  serial::integer<uint32_t>(dr->data_length.get());
+  __data_length = dr->data_length.get();
+
+  serial::string("transfers: ");
+  serial::integer<uint32_t>(transfers);
+}
+
 void walk_directory_record(const iso9660::directory_record * dr)
 {
   if (dr_is_self_or_parent(dr))
@@ -124,6 +195,12 @@ void walk_directory_record(const iso9660::directory_record * dr)
   serial::string("  file_identifier: ");
   serial::string(dr->file_identifier, dr->length_of_file_identifier);
   serial::character('\n');
+
+  if ((dr->file_flags & FILE_FLAGS__DIRECTORY) == 0) {
+    if (is_jvm_bin(dr->file_identifier, dr->length_of_file_identifier)) {
+      load_jvm_bin(dr);
+    }
+  }
 }
 
 void walk_directory(uint16_t * buf, int extent, int num_extents)
@@ -154,7 +231,7 @@ void walk_directory(uint16_t * buf, int extent, int num_extents)
 
 void main()
 {
-  //serial::init(0);
+  serial::init(0);
 
   // gdrom unlock undocumented register
   g1_if.GDUNLOCK = 0x1fffff;
@@ -195,7 +272,24 @@ void main()
   const int data_length = root_dr->data_length.get();
   const int num_extents = data_length >> 11; // division by 2048
 
+  jvm_load_complete = false;
   walk_directory(buf, extent, num_extents);
+  serial::integer<uint32_t>(jvm_load_complete);
+  if (jvm_load_complete) {
+    main_ptr_t jvm_main = reinterpret_cast<main_ptr_t>(load_address);
+    uint8_t * load_buf = reinterpret_cast<uint8_t *>(load_address);
+
+    serial::string("crc32: ");
+    int chunks = __data_length / 2048;
+    for (int i = 0; i < chunks; i++) {
+      uint32_t crc = crc32(&((uint8_t *)load_address)[i * 2048], 2048);
+      serial::integer<uint32_t>(crc);
+    }
+
+    serial::string("jvm jump\n");
+    jvm_main();
+    serial::string("jvm return\n");
+  }
 
   while (1);
 }

holly/video_output.cpp

@@ -38,7 +38,7 @@ void set_framebuffer_resolution(const uint32_t x_size, const uint32_t y_size)
 void set_mode(const struct mode& mode)
 {
   holly.FB_R_CTRL = mode.fb_r_ctrl
-                  | fb_r_ctrl::fb_depth::_0565_rgb_16bit
+                  | fb_r_ctrl::fb_depth::_565_rgb_16bit
                   | fb_r_ctrl::fb_enable;
 
   holly.SPG_LOAD = mode.spg_load;

ip.mk

@@ -22,7 +22,8 @@ SERIAL_LOAD_OBJ = \
 
 GDROM_JVM_BOOT_OBJ = \
 	example/gdrom_jvm_boot.o \
-	sh7091/serial.o
+	sh7091/serial.o \
+	crc32.o
 
 %.o: %.obj
 	$(OBJCOPY) -g \
@@ -34,3 +35,6 @@ serial_load_ip.elf: $(IP_OBJ) $(SERIAL_LOAD_OBJ)
 
 gdrom_jvm_boot_ip.elf: $(IP_OBJ) $(GDROM_JVM_BOOT_OBJ)
 	$(LD) --orphan-handling=error --print-memory-usage -T $(LIB)/ip.lds $^ -o $@
+
+gdrom-jvm-boot-ip-bin: gdrom_jvm_boot_ip.bin
+	cp $< ip.bin