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| author | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-06-08 18:43:18 +0300 |
|---|---|---|
| committer | Kimplul <kimi.h.kuparinen@gmail.com> | 2023-06-08 18:43:18 +0300 |
| commit | dd10667c56b943c19436c6540946f9ad0f71d257 (patch) | |
| tree | 407bb9cea33344831c17347183303e8de0200b78 /arch | |
| parent | a8540ed5cc382ac71716b9978862e57edf274d77 (diff) | |
| download | kmi-dd10667c56b943c19436c6540946f9ad0f71d257.tar.gz kmi-dd10667c56b943c19436c6540946f9ad0f71d257.zip | |
add fast userspace return to do_ipc
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv64/kernel/entry.S | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/riscv64/kernel/entry.S b/arch/riscv64/kernel/entry.S index 32a04f6..2f9a9e6 100644 --- a/arch/riscv64/kernel/entry.S +++ b/arch/riscv64/kernel/entry.S @@ -149,3 +149,24 @@ _load_context: /* assume supervisor for now */ sret + +.global ret_userspace_fast +ret_userspace_fast: + lr sp, offsetof_regs(tp) + addi sp, sp, -sizeof_registers + + lr s0, offsetof_exec(tp) + csrw CSR_SEPC, s0 + + csrw CSR_SSCRATCH, tp + + 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 sp, offsetof_sp(sp) + + sret |