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lib: Fix CPU capabilities detection function

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On some platforms, misa may not be implemented. On such a platform,
reading misa will get 0. At this time, platform is required to
implement a non-standard function to detect the CPU's capabilities.
Therefore, this modification add interfaces for non-standard function.

The MXL field of misa is always at the highest two bits, whether it
is a 32-bit 64-bit or a 128-bit machine. Therefore, this modification
fixes the use of a fixed offset to detect the machine length.

Signed-off-by: Xiang Wang <merle@hardenedlinux.org>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Xiang Wang
2019-11-26 16:06:29 +05:30
committed by Anup Patel
parent 75f903dd78
commit c96cc03fcc
4 changed files with 89 additions and 12 deletions
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13
lib/sbi/sbi_init.c
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@@ -30,10 +30,10 @@
static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
{
int xlen;
char str[64];
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
misa_string(str, sizeof(str));
#ifdef OPENSBI_VERSION_GIT
sbi_printf("\nOpenSBI %s\n", OPENSBI_VERSION_GIT);
#else
@@ -43,9 +43,18 @@ static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
sbi_printf(BANNER);
/* Determine MISA XLEN and MISA string */
xlen = misa_xlen();
if (xlen < 1) {
sbi_printf("Error %d getting MISA XLEN\n", xlen);
sbi_hart_hang();
}
xlen = 16 * (1 << xlen);
misa_string(str, sizeof(str));
/* Platform details */
sbi_printf("Platform Name : %s\n", sbi_platform_name(plat));
sbi_printf("Platform HART Features : RV%d%s\n", misa_xlen(), str);
sbi_printf("Platform HART Features : RV%d%s\n", xlen, str);
sbi_printf("Platform Max HARTs : %d\n",
sbi_platform_hart_count(plat));
sbi_printf("Current Hart : %u\n", hartid);