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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/parisc/kernel/toc_asm.S
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/parisc/kernel/toc_asm.S')
-rw-r--r--arch/parisc/kernel/toc_asm.S75
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/parisc/kernel/toc_asm.S b/arch/parisc/kernel/toc_asm.S
new file mode 100644
index 0000000000..570f5cef52
--- /dev/null
+++ b/arch/parisc/kernel/toc_asm.S
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/* TOC (Transfer of Control) handler. */
+
+ .level 1.1
+
+#include <asm/assembly.h>
+#include <linux/threads.h>
+#include <linux/linkage.h>
+
+ .text
+ .import toc_intr,code
+ .import toc_stack,data
+ .align 16
+ENTRY_CFI(toc_handler)
+ load32 PA(toc_stack),%sp
+
+#ifdef CONFIG_SMP
+ /* get per-cpu toc_stack address. */
+ mfctl %cr30, %r1
+ tophys %r1,%r2 /* task_struct */
+ LDREG TASK_TI_CPU(%r2),%r4 /* cpu */
+ load32 PA(__per_cpu_offset),%r1
+ LDREGX %r4(%r1),%r4
+ add %r4,%sp,%sp
+#endif
+
+ /*
+ * setup pt_regs on stack and save the
+ * floating point registers. PIM_TOC doesn't
+ * save fp registers, so we're doing it here.
+ */
+ copy %sp,%arg0
+ ldo PT_SZ_ALGN(%sp), %sp
+
+ /* clear pt_regs */
+ copy %arg0,%r1
+0: cmpb,<<,n %r1,%sp,0b
+ stw,ma %r0,4(%r1)
+
+ ldo PT_FR0(%arg0),%r25
+ save_fp %r25
+
+ /* go virtual */
+ load32 PA(swapper_pg_dir),%r4
+ mtctl %r4,%cr24
+ mtctl %r4,%cr25
+
+ /* Clear sr4-sr7 */
+ mtsp %r0, %sr4
+ mtsp %r0, %sr5
+ mtsp %r0, %sr6
+ mtsp %r0, %sr7
+
+ tovirt_r1 %sp
+ tovirt_r1 %arg0
+ virt_map
+
+ loadgp
+
+#ifdef CONFIG_64BIT
+ ldo -16(%sp),%r29
+#endif
+ load32 toc_intr,%r1
+ be 0(%sr7,%r1)
+ nop
+ENDPROC_CFI(toc_handler)
+
+ /*
+ * keep this checksum here, as it is part of the toc_handler
+ * spanned by toc_handler_size (all words in toc_handler are
+ * added in PDC and the sum must equal to zero.
+ */
+SYM_DATA(toc_handler_csum, .long 0)
+SYM_DATA(toc_handler_size, .long . - toc_handler)