improve uapi

1 files changed, 0 insertions, 134 deletions

diff --git a/arch/riscv64/kernel/head.S b/arch/riscv64/kernel/head.S
deleted file mode 100644
index cef74ba..0000000
--- a/arch/riscv64/kernel/head.S
+++ /dev/null
@@ -1,134 +0,0 @@
-#include <gen/asm-offsets.h>
-#include <csr.h>
-
-#if __riscv_xlen == 64
-#define sr sd
-#define lr ld
-#else
-#define sr sw
-#define lr lw
-#endif
-
-/* very much based on linux, but why change it if works, eh? */
-.section .text
-.align 4
-.global handle_irq
-handle_irq:
-	csrrw tp, CSR_SSCRATCH, tp
-	bnez tp, _save_context
-	/* the exception came from the kernel, should probably handle but for
-	 * now just spin in place */
-	1: j 1b
-_save_context:
-	/* store user stack pointer and replace it with kernel stack */
-	addi	tp, tp,-sizeof_registers
-	sr	sp, offsetof_sp(tp)
-	mv	sp, tp
-
-	/* set scratch to 0 and move thread pointer back */
-	csrrw tp, CSR_SSCRATCH, x0
-
-	/* save registers */
-	sr      ra, offsetof_ra(sp)
-	sr	gp, offsetof_gp(sp)
-	sr	tp, offsetof_tp(sp)
-	sr      t0, offsetof_t0(sp)
-	sr      t1, offsetof_t1(sp)
-	sr      t2, offsetof_t2(sp)
-	sr      s0, offsetof_s0(sp)
-	sr      a0, offsetof_a0(sp)
-	sr      a1, offsetof_a1(sp)
-	sr      a2, offsetof_a2(sp)
-	sr      a3, offsetof_a3(sp)
-	sr      a4, offsetof_a4(sp)
-	sr      a5, offsetof_a5(sp)
-	sr      a6, offsetof_a6(sp)
-	sr      a7, offsetof_a7(sp)
-	sr	s1, offsetof_s1(sp)
-	sr	s2, offsetof_s2(sp)
-	sr	s3, offsetof_s3(sp)
-	sr	s4, offsetof_s4(sp)
-	sr	s5, offsetof_s5(sp)
-	sr	s6, offsetof_s6(sp)
-	sr	s7, offsetof_s7(sp)
-	sr	s8, offsetof_s8(sp)
-	sr	s9, offsetof_s9(sp)
-	sr	s10,offsetof_s10(sp)
-	sr	s11,offsetof_s11(sp)
-	sr      t3, offsetof_t3(sp)
-	sr      t4, offsetof_t4(sp)
-	sr      t5, offsetof_t5(sp)
-	sr      t6, offsetof_t6(sp)
-
-	/* load supervisor cause */
-	csrr s4, CSR_SCAUSE
-	/* interrupts fall through, exceptions jump */
-	bge s4, zero, handle_exception
-	/* TODO: handle interrupts */
-	j restore_all
-
-handle_exception:
-	li t0, EXC_SYSCALL
-	/* system exceptions fall through, syscalls jump */
-	beq s4, t0, handle_syscall
-	j	restore_all
-
-handle_syscall:
-	/* TODO: CSR_EPC should be moved forward one instruction when dealing
-	 * with syscalls */
-	jal	syscall_dispatch
-	/* if we had a thread switch, load kernel stack of current thread and
-	 * restore its context */
-	/* TODO: is a whole function call necessary? */
-	mv	s0, a0
-	/* get current tcb */
-	call cur_tcb
-	mv	tp, a0
-	/* get associated kernel stack */
-	mv	sp, tp
-	addi	sp, sp, -sizeof_registers
-	j	restore_noreturn
-
-restore_all:
-	lr      s0, offsetof_s0(sp)
-
-restore_noreturn:
-	/* restore registers besides possible return value, assume instruction
-	 * to return to has already been set (CSR_EPC) */
-	csrw CSR_SSCRATCH, tp
-
-	lr      ra, offsetof_ra(sp)
-	lr	gp, offsetof_gp(sp)
-	lr	tp, offsetof_tp(sp)
-	lr      t0, offsetof_t0(sp)
-	lr      t1, offsetof_t1(sp)
-	lr      t2, offsetof_t2(sp)
-	lr      a0, offsetof_a0(sp)
-	lr      a1, offsetof_a1(sp)
-	lr      a2, offsetof_a2(sp)
-	lr      a3, offsetof_a3(sp)
-	lr      a4, offsetof_a4(sp)
-	lr      a5, offsetof_a5(sp)
-	lr      a6, offsetof_a6(sp)
-	lr	s1, offsetof_s1(sp)
-	lr	s2, offsetof_s2(sp)
-	lr	s3, offsetof_s3(sp)
-	lr	s4, offsetof_s4(sp)
-	lr	s5, offsetof_s4(sp)
-	lr	s6, offsetof_s6(sp)
-	lr	s7, offsetof_s7(sp)
-	lr	s8, offsetof_s8(sp)
-	lr	s9, offsetof_s9(sp)
-	lr	s10,offsetof_s10(sp)
-	lr	s11,offsetof_s11(sp)
-	lr      a7, offsetof_a7(sp)
-	lr      t3, offsetof_t3(sp)
-	lr      t4, offsetof_t4(sp)
-	lr      t5, offsetof_t5(sp)
-	lr      t6, offsetof_t6(sp)
-
-	/* restore stack pointer */
-	lr	sp, offsetof_sp(sp)
-
-	/* assume supervisor for now */
-	sret