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https://github.com/openhwgroup/cvw
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47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
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#include "gpt.h"
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#include "boot.h"
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#include <stddef.h>
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/* PSUEDOCODE
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Need to load GPT LBA 1 and read through the partition entries.
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I need to find each of the relevant partition entries, possibly
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by their partition names.
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*/
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int gpt_load_partitions(BYTE card_type) {
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// In this version of the GPT partition code
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// I'm going to assume that the SD card is already initialized.
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// size_t block_size = 512/8;
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// long int lba1_buf[block_size];
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BYTE lba1_buf[512];
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int ret = 0;
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//ret = disk_read(/* BYTE * buf, LBA_t sector, UINT count, BYTE card_type */);
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ret = disk_read(lba1_buf, 1, 1, card_type);
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/* Possible error handling with UART message
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if ( ret != 0 ) {
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}*/
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gpt_pth_t *lba1 = (gpt_pth_t *)lba1_buf;
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BYTE lba2_buf[512];
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ret = disk_read(lba2_buf, (LBA_t)lba1->partition_entries_lba, 1, card_type);
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// Load parition entries for the relevant boot partitions.
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partition_entries_t *fdt = (partition_entries_t *)(lba2_buf);
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partition_entries_t *opensbi = (partition_entries_t *)(lba2_buf + 128);
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partition_entries_t *kernel = (partition_entries_t *)(lba2_buf + 256);
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ret = disk_read((BYTE *)FDT_ADDRESS, fdt->first_lba, fdt->last_lba - fdt->first_lba + 1, card_type);
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ret = disk_read((BYTE *)OPENSBI_ADDRESS, opensbi->first_lba, opensbi->last_lba - opensbi->first_lba + 1, card_type);
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ret = disk_read((BYTE *)KERNEL_ADDRESS, kernel->first_lba,kernel->last_lba - kernel->first_lba + 1, card_type);
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return 0;
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}
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