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fw: simplify switch to FW_RAM

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Daniel Jobson 2024-10-16 16:02:27 +02:00
parent 027978f4d4
commit e21961ca0d
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GPG Key ID: 3707A9DBF4BB8F1A
2 changed files with 10 additions and 24 deletions
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32
hw/application_fpga/fw/tk1/syscall.c
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@ -12,41 +12,27 @@
void inner_syscall(volatile syscall_t *ctx);
void syscall(volatile syscall_t *ctx)
void syscall(syscall_t *ctx)
{
asm volatile("addi x5, sp, 0;" // Save current SP value in x5
"li sp, 0xd0000800;" // Change SP to top of FW_RAM
"addi sp, sp, -4;" // Adjust SP to make space
"sw x5, 0(sp);" // Store originally saved SP value
// in new stack
"addi sp, sp, -4;" // Adjust SP to make space
"sw a0, 0(sp);" // Store the address of *ctx on
// new stack
::
: "memory");
// in new stack
: // No outputs
: // No inputs
: "x5", "memory"); // Clobbers
syscall_t **ctx_local_p = (syscall_t **)0xd00007f8;
syscall_t *ctx_local = *ctx_local_p;
htif_puts("Syscall\n");
htif_putinthex((uint32_t)*ctx_local_p);
htif_lf();
htif_putinthex((uint32_t)ctx_local_p);
htif_lf();
htif_hexdump(ctx_local, sizeof(syscall_t));
htif_lf();
inner_syscall(ctx_local);
inner_syscall(ctx);
asm volatile("lui t0, 0xd0000;" // Load the upper 20 bits
"addi t0, t0, 0x7fc;" // Add the lower 12 bits for full
"lw t1, 0(t0);" // Load the word at address in t0 to t1
"addi sp,t1, 0;" // Copy the value from t1 to sp
::
: "memory");
: // No outputs
: // No inputs
: "t0", "t1", "memory"); // Clobbers
return;
}

2
hw/application_fpga/fw/tk1/syscall.h
View File

@ -33,7 +33,7 @@ enum syscall_cmd {
MGMT_APP_UNREGISTER,
};
void syscall(volatile syscall_t *ctx);
void syscall(syscall_t *ctx);
/*int syscall(syscall_t *ctx);*/
#endif