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sept: Make parsing more readable

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CTCaer 2020-04-30 16:34:24 +03:00
parent 4d1b59c05b
commit 9850dc305c
1 changed files with 38 additions and 22 deletions
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60
bootloader/hos/fss.c
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@ -33,22 +33,28 @@ extern hekate_config h_cfg;
extern bool is_ipl_updated(void *buf, char *path, bool force);
// FSS0 Magic and Meta header offset.
#define FSS0_MAGIC 0x30535346
#define FSS0_META_OFFSET 0x4
// FSS0 Content Types.
#define CNT_TYPE_FSP 0
#define CNT_TYPE_EXO 1
#define CNT_TYPE_WBT 2
#define CNT_TYPE_RBT 3
#define CNT_TYPE_SP1 4
#define CNT_TYPE_SP2 5
#define CNT_TYPE_KIP 6
#define CNT_TYPE_EXO 1 // Exosphere (Secure Monitor).
#define CNT_TYPE_WBT 2 // Warmboot (SC7Exit fw).
#define CNT_TYPE_RBT 3 // Rebootstub (Warmboot based reboot fw).
#define CNT_TYPE_SP1 4 // Sept Primary (TSEC and Sept Secondary loader).
#define CNT_TYPE_SP2 5 // Sept Secondary (Acts as pkg11 and derives keys).
#define CNT_TYPE_KIP 6 // KIP1 (Used for replacement or addition).
#define CNT_TYPE_BMP 7
#define CNT_TYPE_EMC 8
#define CNT_TYPE_KLD 9
#define CNT_TYPE_KRN 10
#define CNT_TYPE_KLD 9 // Kernel Loader.
#define CNT_TYPE_KRN 10 // Kernel.
// FSS0 Content Flags.
#define CNT_FLAG0_EXPERIMENTAL (1 << 0)
typedef struct _fss_t
// FSS0 Meta Header.
typedef struct _fss_meta_t
{
u32 magic;
u32 size;
@ -58,8 +64,9 @@ typedef struct _fss_t
u32 hos_ver;
u32 version;
u32 git_rev;
} fss_t;
} fss_meta_t;
// FSS0 Content Header.
typedef struct _fss_content_t
{
u32 offset;
@ -121,12 +128,15 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt)
return 0;
void *fss = malloc(f_size(&fp));
// Read header.
f_read(&fp, fss, 0x400, NULL);
u32 fss_entry = *(u32 *)(fss + 4);
fss_t *fss_meta = (fss_t *)(fss + fss_entry);
// Read first 1024 bytes of the fss file.
f_read(&fp, fss, 1024, NULL);
// Get FSS0 Meta header offset.
u32 fss_meta_addr = *(u32 *)(fss + FSS0_META_OFFSET);
fss_meta_t *fss_meta = (fss_meta_t *)(fss + fss_meta_addr);
// Check if valid FSS0 and parse it.
if (fss_meta->magic == FSS0_MAGIC)
{
gfx_printf("Found FSS0, Atmosphere %d.%d.%d-%08x\n"
@ -141,20 +151,25 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt)
ctxt->fss0_hosver = fss_meta->hos_ver;
}
// Parse FSS0 contents.
fss_content_t *curr_fss_cnt = (fss_content_t *)(fss + fss_meta->cnt_off);
void *content;
for (u32 i = 0; i < fss_meta->cnt_count; i++)
{
content = (void *)(fss + curr_fss_cnt[i].offset);
// Check if offset is inside limits.
if ((curr_fss_cnt[i].offset + curr_fss_cnt[i].size) > fss_meta->size)
continue;
// If content is experimental and experimental flag is not enabled, skip it.
if ((curr_fss_cnt[i].flags0 & CNT_FLAG0_EXPERIMENTAL) && !ctxt->fss0_enable_experimental)
continue;
// Load content to launch context.
// Parse content.
if (!sept_ctxt)
{
// Prepare content context.
switch (curr_fss_cnt[i].type)
{
case CNT_TYPE_KIP:
@ -176,16 +191,20 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt)
default:
continue;
}
// Load content to launch context.
f_lseek(&fp, curr_fss_cnt[i].offset);
f_read(&fp, content, curr_fss_cnt[i].size, NULL);
}
else
{
// Load content to launch context.
// Load sept content directly to launch context.
switch (curr_fss_cnt[i].type)
{
case CNT_TYPE_SP1:
f_lseek(&fp, curr_fss_cnt[i].offset);
f_read(&fp, sept_ctxt->sept_primary, curr_fss_cnt[i].size, NULL);
continue;
break;
case CNT_TYPE_SP2:
if (!memcmp(curr_fss_cnt[i].name, (sept_ctxt->kb < KB_FIRMWARE_VERSION_810) ? "septsecondary00" : "septsecondary01", 15))
{
@ -194,14 +213,11 @@ int parse_fss(launch_ctxt_t *ctxt, const char *path, fss0_sept_t *sept_ctxt)
sept_used = 1;
goto out;
}
continue;
break;
default:
continue;
break;
}
}
f_lseek(&fp, curr_fss_cnt[i].offset);
f_read(&fp, content, curr_fss_cnt[i].size, NULL);
}
out: