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-rw-r--r--arch/alpha/lib/callback_srm.S109
1 files changed, 109 insertions, 0 deletions
diff --git a/arch/alpha/lib/callback_srm.S b/arch/alpha/lib/callback_srm.S
new file mode 100644
index 000000000..b13c4a231
--- /dev/null
+++ b/arch/alpha/lib/callback_srm.S
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/alpha/lib/callback_srm.S
+ */
+
+#include <asm/console.h>
+#include <asm/export.h>
+
+.text
+#define HWRPB_CRB_OFFSET 0xc0
+
+#if defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC)
+.align 4
+srm_dispatch:
+#if defined(CONFIG_ALPHA_GENERIC)
+ ldl $4,alpha_using_srm
+ beq $4,nosrm
+#endif
+ ldq $0,hwrpb # gp is set up by CALLBACK macro.
+ ldl $25,0($25) # Pick up the wrapper data.
+ mov $20,$21 # Shift arguments right.
+ mov $19,$20
+ ldq $1,HWRPB_CRB_OFFSET($0)
+ mov $18,$19
+ mov $17,$18
+ mov $16,$17
+ addq $0,$1,$2 # CRB address
+ ldq $27,0($2) # DISPATCH procedure descriptor (VMS call std)
+ extwl $25,0,$16 # SRM callback function code
+ ldq $3,8($27) # call address
+ extwl $25,2,$25 # argument information (VMS calling std)
+ jmp ($3) # Return directly to caller of wrapper.
+
+.align 4
+.globl srm_fixup
+.ent srm_fixup
+srm_fixup:
+ ldgp $29,0($27)
+#if defined(CONFIG_ALPHA_GENERIC)
+ ldl $4,alpha_using_srm
+ beq $4,nosrm
+#endif
+ ldq $0,hwrpb
+ ldq $1,HWRPB_CRB_OFFSET($0)
+ addq $0,$1,$2 # CRB address
+ ldq $27,16($2) # VA of FIXUP procedure descriptor
+ ldq $3,8($27) # call address
+ lda $25,2($31) # two integer arguments
+ jmp ($3) # Return directly to caller of srm_fixup.
+.end srm_fixup
+
+#if defined(CONFIG_ALPHA_GENERIC)
+.align 3
+nosrm:
+ lda $0,-1($31)
+ ret
+#endif
+
+#define CALLBACK(NAME, CODE, ARG_CNT) \
+.align 4; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
+ldgp $29,0($27); br $25,srm_dispatch; .word CODE, ARG_CNT; .end callback_##NAME
+
+#else /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
+
+#define CALLBACK(NAME, CODE, ARG_CNT) \
+.align 3; .globl callback_##NAME; .ent callback_##NAME; callback_##NAME##: \
+lda $0,-1($31); ret; .end callback_##NAME
+
+.align 3
+.globl srm_fixup
+.ent srm_fixup
+srm_fixup:
+ lda $0,-1($31)
+ ret
+.end srm_fixup
+#endif /* defined(CONFIG_ALPHA_SRM) || defined(CONFIG_ALPHA_GENERIC) */
+
+CALLBACK(puts, CCB_PUTS, 4)
+CALLBACK(open, CCB_OPEN, 3)
+CALLBACK(close, CCB_CLOSE, 2)
+CALLBACK(read, CCB_READ, 5)
+CALLBACK(open_console, CCB_OPEN_CONSOLE, 1)
+CALLBACK(close_console, CCB_CLOSE_CONSOLE, 1)
+CALLBACK(getenv, CCB_GET_ENV, 4)
+CALLBACK(setenv, CCB_SET_ENV, 4)
+CALLBACK(getc, CCB_GETC, 2)
+CALLBACK(reset_term, CCB_RESET_TERM, 2)
+CALLBACK(term_int, CCB_SET_TERM_INT, 3)
+CALLBACK(term_ctl, CCB_SET_TERM_CTL, 3)
+CALLBACK(process_keycode, CCB_PROCESS_KEYCODE, 3)
+CALLBACK(ioctl, CCB_IOCTL, 6)
+CALLBACK(write, CCB_WRITE, 5)
+CALLBACK(reset_env, CCB_RESET_ENV, 4)
+CALLBACK(save_env, CCB_SAVE_ENV, 1)
+CALLBACK(pswitch, CCB_PSWITCH, 3)
+CALLBACK(bios_emul, CCB_BIOS_EMUL, 5)
+
+EXPORT_SYMBOL(callback_getenv)
+EXPORT_SYMBOL(callback_setenv)
+EXPORT_SYMBOL(callback_save_env)
+
+.data
+__alpha_using_srm: # For use by bootpheader
+ .long 7 # value is not 1 for link debugging
+ .weak alpha_using_srm; alpha_using_srm = __alpha_using_srm
+__callback_init_done: # For use by bootpheader
+ .long 7 # value is not 1 for link debugging
+ .weak callback_init_done; callback_init_done = __callback_init_done
+