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lib: sbi_hart: Detect number of supported PMP regions

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It is not mandatory for a RISC-V systems to implement all PMP
regions so we have to check all PMPADDRx CSRs to determine excat
number of supported PMP regions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Anup Patel
2020-05-18 12:04:18 +05:30
committed by Anup Patel
parent 2966510eed
commit a38bea9341
4 changed files with 103 additions and 52 deletions
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34
lib/utils/fdt/fdt_fixup.c
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@@ -8,7 +8,6 @@
*/
#include <libfdt.h>
#include <sbi/riscv_asm.h>
#include <sbi/sbi_console.h>
#include <sbi/sbi_math.h>
#include <sbi/sbi_hart.h>
@@ -183,6 +182,15 @@ int fdt_reserved_memory_fixup(void *fdt)
return err;
}
/*
* We assume the given device tree does not contain any memory region
* child node protected by PMP. Normally PMP programming happens at
* M-mode firmware. The memory space used by OpenSBI is protected.
* Some additional memory spaces may be protected by platform codes.
*
* With above assumption, we create child nodes directly.
*/
if (!sbi_hart_has_feature(scratch, SBI_HART_HAS_PMP)) {
/*
* Update the DT with firmware start & size even if PMP is not
@@ -193,24 +201,18 @@ int fdt_reserved_memory_fixup(void *fdt)
size = (1UL << log2roundup(scratch->fw_size));
return fdt_resv_memory_update_node(fdt, addr, size, 0, parent);
}
/*
* We assume the given device tree does not contain any memory region
* child node protected by PMP. Normally PMP programming happens at
* M-mode firmware. The memory space used by OpenSBI is protected.
* Some additional memory spaces may be protected by platform codes.
*
* With above assumption, we create child nodes directly.
*/
for (i = 0, j = 0; i < PMP_COUNT; i++) {
pmp_get(i, &prot, &addr, &size);
for (i = 0, j = 0; i < sbi_hart_pmp_count(scratch); i++) {
err = sbi_hart_pmp_get(scratch, i, &prot, &addr, &size);
if (err)
continue;
if (!(prot & PMP_A))
continue;
if (!(prot & (PMP_R | PMP_W | PMP_X))) {
return fdt_resv_memory_update_node(fdt, addr, size,
j, parent);
j++;
}
if (prot & (PMP_R | PMP_W | PMP_X))
continue;
fdt_resv_memory_update_node(fdt, addr, size, j, parent);
j++;
}
return 0;