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DBT-RISE-TGC
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rework PMP check and fix MISA for TGC_D

This commit is contained in:
Eyck Jentzsch 2021-11-09 15:55:22 +01:00
parent bfa8166223
commit fd98ad95f6
2 changed files with 25 additions and 31 deletions
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2
gen_input/TGC_D.core_desc
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@ -7,7 +7,7 @@ Core TGC_D provides RV32I, Zicsr, Zifencei, RV32M, RV32IC {
XLEN=32;
// definitions for the architecture wrapper
// XL ZYXWVUTSRQPONMLKJIHGFEDCBA
unsigned MISA_VAL = 0b01000000000000000001000100000100;
unsigned MISA_VAL = 0b01000000000100000011000100000100;
unsigned MARCHID_VAL = 0x80000004;
}
}

46
incl/iss/arch/riscv_hart_mu_p.h
View File

@ -554,42 +554,36 @@ 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;
reg_t base = 0;
constexpr auto pmp_num_regs = 16;
reg_t tor_base = 0;
auto any_active = false;
for (size_t i = 0; i < 16; i++) {
reg_t tor = csr[pmpaddr0+i] << PMP_SHIFT;
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 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;
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));
}
}
base = tor;
tor_base = pmpaddr;
}
return !any_active || this->reg.PRIV == PRIV_M;
}