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synthesize fat root dir

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R
2024-04-13 18:27:52 +01:00
parent ec709c9e11
commit 509193ebe6
1 changed files with 70 additions and 3 deletions
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bootloader.c
+70 -3
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@@ -94,6 +94,55 @@ const uint8_t INQUIRY_RESPONSE[36] __attribute__((aligned(16))) = {
' ', ' ', ' ', ' ',
};
const uint8_t BOOT_SECTOR[0x3e] __attribute__((aligned(16))) = {
0x00, 0x00, 0x00, // jump
'A', 'r', 'c', 'a', 'n', 'e', 'N', 'b', // oem name
0x00, 0x02, // 512 bytes/sector
0x01, // 1 sector/cluster
0x01, 0x00, // 1 reserved sector
0x01, // 1 fat
0x10, 0x00, // 16 root dir entries
0x00, 0x40, // num sectors
0xf8, // media descriptor
0x40, 0x00, // 16384 sectors/clusters -> 64 FAT sectors
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // useless stuff
0x80, // "drive number"
0x00, // reserved
0x29, // magic
0xde, 0xad, 0xbe, 0xef, // serial number
'C', 'H', '3', '2', 'V', ' ', 'U', 'F', '2', ' ', ' ', // volume label
'F', 'A', 'T', '1', '6', ' ', ' ', ' ', // fs type
};
const uint8_t ROOT_DIR[32 * 3] __attribute__((aligned(16))) = {
'C', 'H', '3', '2', 'V', ' ', 'U', 'F', '2', ' ', ' ', // name
0x08, // attributes (volume label)
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // start cluster
0x00, 0x00, 0x00, 0x00, // file size]
'I', 'N', 'F', 'O', '_', 'U', 'F', '2', 'T', 'X', 'T', // name
0x01, // attributes (RO)
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // start cluster
0x00, 0x00, 0x00, 0x00, // file size
'I', 'N', 'D', 'E', 'X', ' ', ' ', ' ', 'H', 'T', 'M', // name
0x01, // attributes (RO)
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, // timestamps
0x00, 0x00, // start cluster
0x00, 0x00, 0x00, 0x00, // file size
};
#define ESIG_UNIID(x) (*(volatile uint8_t*)(0x1FFFF7E8 + (x)))
// XXX manual claims 96 bits but only 64 bits seem to actually be programmed?
@@ -157,11 +206,29 @@ __attribute__((always_inline)) static inline uint32_t min(uint32_t a, uint32_t b
}
__attribute__((always_inline)) static inline void synthesize_block(uint32_t block, uint32_t piece) {
if (piece == 0) {
USB_EP1_IN(0) = block;
USB_EP1_IN(2) = block >> 16;
if (block == 0) {
if (piece == 0) {
for (int i = 0; i < sizeof(BOOT_SECTOR) / 2; i++)
USB_EP1_IN(i * 2) = ((uint16_t*)BOOT_SECTOR)[i];
for (int i = sizeof(BOOT_SECTOR) / 2; i < 32; i++)
USB_EP1_IN(i * 2) = 0;
} else {
for (int i = 0; i < 32; i++)
USB_EP1_IN(i * 2) = 0;
}
} else if (block == 1 && piece == 0) {
USB_EP1_IN(0) = 0xfff8;
USB_EP1_IN(2) = 0xffff;
for (int i = 2; i < 32; i++)
USB_EP1_IN(i * 2) = 0;
} else if (block == 65 && piece == 0) {
for (int i = 0; i < 32; i++)
USB_EP1_IN(i * 2) = ((uint16_t*)ROOT_DIR)[i];
} else if (block == 65 && piece == 1) {
for (int i = 0; i < 16; i++)
USB_EP1_IN(i * 2) = ((uint16_t*)ROOT_DIR)[32+ i];
for (int i = 16; i < 32; i++)
USB_EP1_IN(i * 2) = 0;
} else {
for (int i = 0; i < 32; i++)
USB_EP1_IN(i * 2) = 0;