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pulp-runtime/kernel/hmr_synch.c
Michael Rogenmoser 90a4c57a42 Update critical section code for functionality
2023-02-10 11:16:38 +01:00

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/*
* Copyright (C) 2023 ETH Zurich, University of Bologna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <pulp.h>
#define QUAUX(X) #X
#define QU(X) QUAUX(X)
#define HMR_STATE_ALLOC_SIZE 0xA0
void __attribute__((naked)) pos_hmr_store_state_to_stack() {
__asm__ __volatile__ (
// Allocate space on the stack
"add sp, sp, -" QU(HMR_STATE_ALLOC_SIZE) " \n\t"
// Store registers to stack
// zero not stored as hardwired // x0
"sw ra, 0x00(sp) \n\t" // x1
// sp stored to HMR once complete // x2
"sw gp, 0x04(sp) \n\t" // x3
"sw tp, 0x08(sp) \n\t" // x4
"sw t0, 0x0C(sp) \n\t" // x5
"sw t1, 0x10(sp) \n\t" // x6
"sw t2, 0x14(sp) \n\t" // x7
"sw x8, 0x18(sp) \n\t" // fp
"sw s1, 0x1C(sp) \n\t" // x9
"sw a0, 0x20(sp) \n\t" // x10
"sw a1, 0x24(sp) \n\t" // x11
"sw a2, 0x28(sp) \n\t" // x12
"sw a3, 0x2C(sp) \n\t" // x13
"sw a4, 0x30(sp) \n\t" // x14
"sw a5, 0x34(sp) \n\t" // x15
"sw a6, 0x38(sp) \n\t" // x16
"sw a7, 0x3C(sp) \n\t" // x17
"sw s2, 0x40(sp) \n\t" // x18
"sw s3, 0x44(sp) \n\t" // x19
"sw s4, 0x48(sp) \n\t" // x20
"sw s5, 0x4C(sp) \n\t" // x21
"sw s6, 0x50(sp) \n\t" // x22
"sw s7, 0x54(sp) \n\t" // x23
"sw s8, 0x58(sp) \n\t" // x24
"sw s9, 0x5C(sp) \n\t" // x25
"sw s10, 0x60(sp) \n\t" // x26
"sw s11, 0x64(sp) \n\t" // x27
"sw t3, 0x68(sp) \n\t" // x28
"sw t4, 0x6C(sp) \n\t" // x29
"sw t5, 0x70(sp) \n\t" // x30
"sw t6, 0x74(sp) \n\t" // x31
// Manually store necessary CSRs
"csrr t1, 0x341 \n\t" // mepc
"csrr t2, 0x300 \n\t" // mstatus
"sw t1, 0x78(sp) \n\t" // mepc
"csrr t1, 0x304 \n\t" // mie
"sw t2, 0x7C(sp) \n\t" // mstatus
"csrr t2, 0x305 \n\t" // mtvec
"sw t1, 0x80(sp) \n\t" // mie
"csrr t1, 0x340 \n\t" // mscratch
"sw t2, 0x84(sp) \n\t" // mtvec
"csrr t2, 0x342 \n\t" // mcause
"sw t1, 0x88(sp) \n\t" // mscratch
"csrr t1, 0x343 \n\t" // mtval
"sw t2, 0x8C(sp) \n\t" // mcause
#ifdef __ibex__
"csrr t2, 0x7d0 \n\t" // miex
#endif // __ibex__
"sw t1, 0x90(sp) \n\t" // mtval
#ifdef __ibex__
"csrr t1, 0x7d1 \n\t" // mtvecx
"sw t2, 0x94(sp) \n\t" // miex
"sw t1, 0x98(sp) \n\t" // mtvecx
#endif // __ibex__
: : : "memory");
}
// loads state from stack, except for ra which is stored at `0x00(sp)` before and `-HMR_STATE_ALLOC_SIZE(sp)` afterwards
void __attribute__((naked)) pos_hmr_load_state_from_stack() {
__asm__ __volatile__ (
// Manually load necessary CSRs
"lw t1, 0x78(sp) \n\t" // mepc
"lw t2, 0x7C(sp) \n\t" // mstatus
"csrw 0x341, t1 \n\t" // mepc
"lw t1, 0x80(sp) \n\t" // mie
"csrw 0x300, t2 \n\t" // mstatus
"lw t2, 0x84(sp) \n\t" // mtvec
"csrw 0x304, t1 \n\t" // mie
"lw t1, 0x88(sp) \n\t" // mscratch
"csrw 0x305, t2 \n\t" // mtvec
"lw t2, 0x8C(sp) \n\t" // mcause
"csrw 0x340, t1 \n\t" // mscratch
"lw t1, 0x90(sp) \n\t" // mtval
"csrw 0x342, t2 \n\t" // mcause
#ifdef __ibex__
"lw t2, 0x94(sp) \n\t" // miex
#endif // __ibex__
"csrw 0x343, t1 \n\t" // mtval
#ifdef __ibex__
"lw t1, 0x98(sp) \n\t" // mtvecx
"csrw 0x7d0, t2 \n\t" // miex
"csrw 0x7d1, t1 \n\t" // mtvecx
#endif // __ibex__
// Load registers from stack
// zero not loaded as hardwired // x0
// ra not touched
// "lw ra, 0x00(sp) \n\t" // x1
// sp loaded from HMR regs above // x2
"lw gp, 0x04(sp) \n\t" // x3
"lw tp, 0x08(sp) \n\t" // x4
"lw t0, 0x0C(sp) \n\t" // x5
"lw t1, 0x10(sp) \n\t" // x6
"lw t2, 0x14(sp) \n\t" // x7
"lw x8, 0x18(sp) \n\t" // fp
"lw s1, 0x1C(sp) \n\t" // x9
"lw a0, 0x20(sp) \n\t" // x10
"lw a1, 0x24(sp) \n\t" // x11
"lw a2, 0x28(sp) \n\t" // x12
"lw a3, 0x2C(sp) \n\t" // x13
"lw a4, 0x30(sp) \n\t" // x14
"lw a5, 0x34(sp) \n\t" // x15
"lw a6, 0x38(sp) \n\t" // x16
"lw a7, 0x3C(sp) \n\t" // x17
"lw s2, 0x40(sp) \n\t" // x18
"lw s3, 0x44(sp) \n\t" // x19
"lw s4, 0x48(sp) \n\t" // x20
"lw s5, 0x4C(sp) \n\t" // x21
"lw s6, 0x50(sp) \n\t" // x22
"lw s7, 0x54(sp) \n\t" // x23
"lw s8, 0x58(sp) \n\t" // x24
"lw s9, 0x5C(sp) \n\t" // x25
"lw s10, 0x60(sp) \n\t" // x26
"lw s11, 0x64(sp) \n\t" // x27
"lw t3, 0x68(sp) \n\t" // x28
"lw t4, 0x6C(sp) \n\t" // x29
"lw t5, 0x70(sp) \n\t" // x30
"lw t6, 0x74(sp) \n\t" // x31
// Release space on the stack
"add sp, sp, " QU(HMR_STATE_ALLOC_SIZE) " \n\t"
: : : "memory");
}
void __attribute__((interrupt)) pos_hmr_tmr_reload() {
// get sp from tmr reg
__asm__ __volatile__(
"csrr t0, 0xf14 \n\t" // Read core id
"li t1, " QU(ARCHI_HMR_ADDR + HMR_CORE_OFFSET) " \n\t"
"andi t0, t0, 0x01f \n\t"
"sll t0, t0, " QU(HMR_CORE_SLL) " \n\t"
"add t0, t0, t1 \n\t"
"lw sp, " QU(HMR_CORE_REGS_SP_STORE_REG_OFFSET) "(t0) \n\t"
"mv ra, t0 \n\t"
: : : "memory");
pos_hmr_load_state_from_stack();
// set tmr reg to 0
__asm__ __volatile__(
"sw zero, " QU(HMR_CORE_REGS_SP_STORE_REG_OFFSET) "(ra) \n\t"
"lw ra, -" QU(HMR_STATE_ALLOC_SIZE) "(sp) \n\t"
: : : "memory");
// mret handled by __attribute((interrupt))
// __asm__ __volatile__("mret" : : : "memory");
}
void __attribute__((naked)) pos_hmr_tmr_irq() {
pos_hmr_store_state_to_stack();
// store sp to hmr core reg
__asm__ __volatile__(
"csrr t0, 0xf14 \n\t" // Read core id
"li t1, " QU(ARCHI_HMR_ADDR + HMR_CORE_OFFSET) " \n\t"
"andi t0, t0, 0x01f \n\t"
"sll t0, t0, " QU(HMR_CORE_SLL) " \n\t"
"add t0, t0, t1 \n\t"
"sw sp, " QU(HMR_CORE_REGS_SP_STORE_REG_OFFSET) "(t0) \n\t"
: : : "memory");
// several nops to delay and allow for core reset
__asm__ __volatile__(
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: : : "memory");
pos_hmr_tmr_reload();
}
void __attribute__((naked)) pos_hmr_tmr_synch() {
pos_hmr_store_state_to_stack();
// store sp to hmr core reg
__asm__ __volatile__(
"csrr t0, 0xf14 \n\t" // Read core id
"li t1, " QU(ARCHI_HMR_ADDR + HMR_CORE_OFFSET) " \n\t"
"andi t0, t0, 0x01f \n\t"
"sll t0, t0, " QU(HMR_CORE_SLL) " \n\t"
"add t0, t0, t1 \n\t"
"sw sp, " QU(HMR_CORE_REGS_SP_STORE_REG_OFFSET) "(t0) \n\t"
: : : "memory");
// enter barrier -> this should lock the cores together
eu_bar_trig_wait_clr(eu_bar_addr(TMR_BARRIER_ID(TMR_GROUP_ID(core_id()))));
// several nops to delay and allow for core reset
__asm__ __volatile__(
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
"nop\n\t"
: : : "memory");
pos_hmr_tmr_reload();
}
int hmr_tmr_critical_section(int (*function_handle)()) {
int ret = 0;
if (TMR_IS_MAIN_CORE(core_id())) {
// enter critical section
hmr_self_enable_tmr();
// do critical stuff
ret += function_handle();
// exit critical section
hmr_disable_tmr(0, TMR_GROUP_ID(core_id()));
}
return ret;
}
// void pos_hmr_tmr_unsync() {
// // Update event unit mask
// // write unsync to hmr tmr ctrl reg
// if (!TMR_IS_MAIN_CORE(core_id())) {
// // get sp from a core reg
// if (sp == 0) {
// j
// }
// pos_hmr_load_state_from_stack();
// // mret?
// }
// }
// void pos_hmr_create_checkpoint() {
// // get checkpoint addr (or alloc the space?) --> will be complex for stack...
// // pos_hmr_store_state_to(addr)
// // store addr to dmr reg? --> need to properly manage this...
// }
// void pos_hmr_load_checkpoint() {
// // load addr from dmr reg?
// // pos_hmr_load_state_from(addr)
// // mret? ret?
// }
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