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lib: sbi: Add sbi_domain_check_addr_range() function

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We add sbi_domain_check_addr_range() helper function to check
whether a given address range is accessible under a particular
domain.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
This commit is contained in:
Anup Patel 2022-11-23 11:46:16 +05:30 • committed by Anup Patel
parent 4e0572f57b
commit eab48c33a1
2 changed files with 84 additions and 0 deletions
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15
include/sbi/sbi_domain.h
View file

@ -196,6 +196,21 @@ bool sbi_domain_check_addr(const struct sbi_domain *dom,
unsigned long addr, unsigned long mode,
unsigned long access_flags);
/**
* Check whether we can access specified address range for given mode and
* memory region flags under a domain
* @param dom pointer to domain
* @param addr the start of the address range to be checked
* @param size the size of the address range to be checked
* @param mode the privilege mode of access
* @param access_flags bitmask of domain access types (enum sbi_domain_access)
* @return TRUE if access allowed otherwise FALSE
*/
bool sbi_domain_check_addr_range(const struct sbi_domain *dom,
unsigned long addr, unsigned long size,
unsigned long mode,
unsigned long access_flags);
/** Dump domain details on the console */
void sbi_domain_dump(const struct sbi_domain *dom, const char *suffix);

69
lib/sbi/sbi_domain.c
View file

@ -212,6 +212,44 @@ static bool is_region_before(const struct sbi_domain_memregion *regA,
return false;
}
static const struct sbi_domain_memregion *find_region(
const struct sbi_domain *dom,
unsigned long addr)
{
unsigned long rstart, rend;
struct sbi_domain_memregion *reg;
sbi_domain_for_each_memregion(dom, reg) {
rstart = reg->base;
rend = (reg->order < __riscv_xlen) ?
rstart + ((1UL << reg->order) - 1) : -1UL;
if (rstart <= addr && addr <= rend)
return reg;
}
return NULL;
}
static const struct sbi_domain_memregion *find_next_subset_region(
const struct sbi_domain *dom,
const struct sbi_domain_memregion *reg,
unsigned long addr)
{
struct sbi_domain_memregion *sreg, *ret = NULL;
sbi_domain_for_each_memregion(dom, sreg) {
if (sreg == reg || (sreg->base <= addr) ||
!is_region_subset(sreg, reg))
continue;
if (!ret || (sreg->base < ret->base) ||
((sreg->base == ret->base) && (sreg->order < ret->order)))
ret = sreg;
}
return ret;
}
static int sanitize_domain(const struct sbi_platform *plat,
struct sbi_domain *dom)
{
@ -320,6 +358,37 @@ static int sanitize_domain(const struct sbi_platform *plat,
return 0;
}
bool sbi_domain_check_addr_range(const struct sbi_domain *dom,
unsigned long addr, unsigned long size,
unsigned long mode,
unsigned long access_flags)
{
unsigned long max = addr + size;
const struct sbi_domain_memregion *reg, *sreg;
if (!dom)
return false;
while (addr < max) {
reg = find_region(dom, addr);
if (!reg)
return false;
if (!sbi_domain_check_addr(dom, addr, mode, access_flags))
return false;
sreg = find_next_subset_region(dom, reg, addr);
if (sreg)
addr = sreg->base;
else if (reg->order < __riscv_xlen)
addr = reg->base + (1UL << reg->order);
else
break;
}
return true;
}
void sbi_domain_dump(const struct sbi_domain *dom, const char *suffix)
{
u32 i, k;