Changeset 1f12fab in mainline for kernel/arch/sparc32/src/start.S

Timestamp:

2013-10-07T20:00:34Z (11 years ago)

Author:

Jakub Klama <jakub.klama@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

a73ebf0

Parents:

80d9d83

Message:

First attempt to implement preemptive trap handlers
and switch to userspace. Preemptive traps are needed
for at least page faults, as page fault handling code
can trigger window underflow/overflow exceptions.

This commit also introduces userspace window buffer
for saving userspace register windows (just as in
sparc64).

These changes are unfinished and far from working
correctly.

File:

• kernel/arch/sparc32/src/start.S (modified) (2 diffs)

kernel/arch/sparc32/src/start.S

@@ -31 +31 @@
 .global kernel_image_start
 .global early_putchar
+.global kernel_sp
+.global uspace_wbuf
 
 kernel_image_start:
@@ -68 +70 @@
         nop
 
+kernel_sp:
+.space 4
+
+uspace_wbuf:
+.space 4
+
 .align 16
 .space 4096