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revert pmp check implementation

This commit is contained in:
Eyck Jentzsch 2021-11-11 09:58:19 +01:00
parent f90c48e881
commit 43d7b99905
1 changed files with 61 additions and 24 deletions
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85
incl/iss/arch/riscv_hart_mu_p.h
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@ -554,37 +554,74 @@ template <typename BASE, features_e FEAT> bool riscv_hart_mu_p<BASE, FEAT>::pmp_
constexpr auto PMP_TOR =0x1U;
constexpr auto PMP_NA4 =0x2U;
constexpr auto PMP_NAPOT =0x3U;
constexpr auto pmp_num_regs = 16;
reg_t tor_base = 0;
reg_t base = 0;
auto any_active = false;
auto lower_addr = addr >>2;
auto upper_addr = (addr+len-1)>>2;
for (size_t i = 0; i < pmp_num_regs; i++) {
for (size_t i = 0; i < 16; i++) {
reg_t tor = csr[pmpaddr0+i] << PMP_SHIFT;
uint8_t cfg = csr[pmpcfg0+(i/4)]>>(i%4);
uint8_t cfg_next = i==(pmp_num_regs-1)? 0 : csr[pmpcfg0+((i+1)/4)]>>((i+1)%4);
auto pmpaddr = csr[pmpaddr0+i];
if (cfg & PMP_A) {
any_active=true;
auto is_tor = bit_sub<3, 2>(cfg) == PMP_TOR;
auto is_napot = bit_sub<4, 1>(cfg) && bit_sub<3, 2>(cfg_next)!= PMP_TOR;
if(is_napot) {
reg_t mask = bit_sub<3, 1>(cfg)?~( pmpaddr & ~(pmpaddr + 1)): 0x3fffffff;
auto mpmpaddr = pmpaddr & mask;
if((lower_addr&mask) == mpmpaddr && (upper_addr&mask)==mpmpaddr)
return (this->reg.PRIV == PRIV_M && !(cfg & PMP_L)) ||
(type == access_type::READ && (cfg & PMP_R)) ||
(type == access_type::WRITE && (cfg & PMP_W)) ||
(type == access_type::FETCH && (cfg & PMP_X));
} else if(is_tor) {
if(lower_addr>=tor_base && upper_addr<=pmpaddr)
return (this->reg.PRIV == PRIV_M && !(cfg & PMP_L)) ||
(type == access_type::READ && (cfg & PMP_R)) ||
(type == access_type::WRITE && (cfg & PMP_W)) ||
(type == access_type::FETCH && (cfg & PMP_X));
auto pmp_a = (cfg & PMP_A) >> 3;
auto is_tor = pmp_a == PMP_TOR;
auto is_na4 = pmp_a == PMP_NA4;
reg_t mask = (csr[pmpaddr0+i] << 1) | (!is_na4);
mask = ~(mask & ~(mask + 1)) << PMP_SHIFT;
// Check each 4-byte sector of the access
auto any_match = false;
auto all_match = true;
for (reg_t offset = 0; offset < len; offset += 1 << PMP_SHIFT) {
reg_t cur_addr = addr + offset;
auto napot_match = ((cur_addr ^ tor) & mask) == 0;
auto tor_match = base <= cur_addr && cur_addr < tor;
auto match = is_tor ? tor_match : napot_match;
any_match |= match;
all_match &= match;
}
if (any_match) {
// If the PMP matches only a strict subset of the access, fail it
if (!all_match)
return false;
return (this->reg.PRIV == PRIV_M && !(cfg & PMP_L)) ||
(type == access_type::READ && (cfg & PMP_R)) ||
(type == access_type::WRITE && (cfg & PMP_W)) ||
(type == access_type::FETCH && (cfg & PMP_X));
}
}
tor_base = pmpaddr;
base = tor;
}
// constexpr auto pmp_num_regs = 16;
// reg_t tor_base = 0;
// auto any_active = false;
// auto lower_addr = addr >>2;
// auto upper_addr = (addr+len-1)>>2;
// for (size_t i = 0; i < pmp_num_regs; i++) {
// uint8_t cfg = csr[pmpcfg0+(i/4)]>>(i%4);
// uint8_t cfg_next = i==(pmp_num_regs-1)? 0 : csr[pmpcfg0+((i+1)/4)]>>((i+1)%4);
// auto pmpaddr = csr[pmpaddr0+i];
// if (cfg & PMP_A) {
// any_active=true;
// auto is_tor = bit_sub<3, 2>(cfg) == PMP_TOR;
// auto is_napot = bit_sub<4, 1>(cfg) && bit_sub<3, 2>(cfg_next)!= PMP_TOR;
// if(is_napot) {
// reg_t mask = bit_sub<3, 1>(cfg)?~( pmpaddr & ~(pmpaddr + 1)): 0x3fffffff;
// auto mpmpaddr = pmpaddr & mask;
// if((lower_addr&mask) == mpmpaddr && (upper_addr&mask)==mpmpaddr)
// return (this->reg.PRIV == PRIV_M && !(cfg & PMP_L)) ||
// (type == access_type::READ && (cfg & PMP_R)) ||
// (type == access_type::WRITE && (cfg & PMP_W)) ||
// (type == access_type::FETCH && (cfg & PMP_X));
// } else if(is_tor) {
// if(lower_addr>=tor_base && upper_addr<=pmpaddr)
// return (this->reg.PRIV == PRIV_M && !(cfg & PMP_L)) ||
// (type == access_type::READ && (cfg & PMP_R)) ||
// (type == access_type::WRITE && (cfg & PMP_W)) ||
// (type == access_type::FETCH && (cfg & PMP_X));
// }
// }
// tor_base = pmpaddr;
// }
return !any_active || this->reg.PRIV == PRIV_M;
}