54 lines
2.0 KiB
C
54 lines
2.0 KiB
C
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/* deshab/block.h - block provider 便捷访问层
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*
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* 封装从 dkm_kernel_api 获取 block API 并调用 read/write 的样板代码，
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* 消除散落在各应用的硬编码偏移（+0xA8 / +0x10 / +0x18）。
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*
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* 用法：
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* dsb_block blk;
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* if (dsb_block_init(&blk, ctx->dkm_kernel_api) == 0) {
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* dsb_block_read(&blk, 0, 256, buf);
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* dsb_block_write(&blk, 0, 1, buf);
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* }
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*/
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#ifndef DESHAB_BLOCK_H
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#define DESHAB_BLOCK_H
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#include "types.h"
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#include "kernel_api.h"
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typedef struct dsb_block {
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const dkm_block_api *api;
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/* 便捷函数指针（从 block_api 解析）。index 固定 0，与现有应用一致。 */
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int (*read)(u32 index, u64 lba, u32 count, void *buffer);
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int (*write)(u32 index, u64 lba, u32 count, const void *buffer);
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} dsb_block;
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/* 从 kernel_api 指针初始化 block 便捷结构。
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* kernel_api_u64 为 dsk_boot_context.dkm_kernel_api 的值（u64 指针）。
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* 返回 0 成功，-1 无 block API。 */
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static inline int dsb_block_init(dsb_block *b, u64 kernel_api_u64) {
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b->api = 0;
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b->read = 0;
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b->write = 0;
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if (!kernel_api_u64) return -1;
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/* block API 指针位于 kernel_api + DSB_KAPI_OFF_BLOCK */
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const dkm_block_api *blk_api = *(const dkm_block_api **)(kernel_api_u64 + DSB_KAPI_OFF_BLOCK);
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if (!blk_api) return -1;
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b->api = blk_api;
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/* read @ +0x10, write @ +0x18（dkm_block_api 结构内偏移） */
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b->read = (int (*)(u32, u64, u32, void *))(*(u64 *)((u64)blk_api + 0x10));
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b->write = (int (*)(u32, u64, u32, const void *))(*(u64 *)((u64)blk_api + 0x18));
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return 0;
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}
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/* 便捷读写（index 固定 0，与现有应用一致）。返回 0 成功。 */
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static inline int dsb_block_read(dsb_block *b, u64 lba, u32 count, void *buf) {
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return b->read ? b->read(0, lba, count, buf) : -1;
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}
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static inline int dsb_block_write(dsb_block *b, u64 lba, u32 count, const void *buf) {
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return b->write ? b->write(0, lba, count, buf) : -1;
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}
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#endif /* DESHAB_BLOCK_H */
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