linux-kernel - [PATCH v2 24/28] sparc32: Drop unused trampoline code

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Date: Sat, 09 Mar 2024 19:15:45 +0100
From: Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@...nel.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Arnd Bergmann <arnd@...nel.org>, Andreas Larsson <andreas@...sler.com>
Cc: Helge Deller <deller@....de>, Randy Dunlap <rdunlap@...radead.org>, 
 John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>, 
 Mark Cave-Ayland <mark.cave-ayland@...nde.co.uk>, 
 Kjetil Oftedal <oftedal@...il.com>, Thomas Zimmermann <tzimmermann@...e.de>, 
 Alexander Viro <viro@...iv.linux.org.uk>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Alan Stern <stern@...land.harvard.edu>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, sparclinux@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
 linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 linux-sound@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v2 24/28] sparc32: Drop unused trampoline code

From: Sam Ravnborg <sam@...nborg.org>

Drop the sun4m and sun4d code from trampoline_32

Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Acked-by: Arnd Bergmann <arnd@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Andreas Larsson <andreas@...sler.com>
---
 arch/sparc/kernel/kernel.h        |   3 +-
 arch/sparc/kernel/trampoline_32.S | 127 +-------------------------------------
 2 files changed, 3 insertions(+), 127 deletions(-)

diff --git a/arch/sparc/kernel/kernel.h b/arch/sparc/kernel/kernel.h
index c2aaddedf097..2c57677770ff 100644
--- a/arch/sparc/kernel/kernel.h
+++ b/arch/sparc/kernel/kernel.h
@@ -112,8 +112,7 @@ extern unsigned int real_irq_entry[];
 extern unsigned int smp4d_ticker[];
 
 /* trampoline_32.S */
-extern unsigned long sun4m_cpu_startup;
-extern unsigned long sun4d_cpu_startup;
+void leon_smp_cpu_startup(int boot_cpu);
 
 /* signal_32.c */
 asmlinkage void do_sigreturn(struct pt_regs *regs);
diff --git a/arch/sparc/kernel/trampoline_32.S b/arch/sparc/kernel/trampoline_32.S
index 82fafeeb3a62..685b20923f6b 100644
--- a/arch/sparc/kernel/trampoline_32.S
+++ b/arch/sparc/kernel/trampoline_32.S
@@ -15,136 +15,12 @@
 #include <asm/contregs.h>
 #include <asm/thread_info.h>
 
-	.globl sun4m_cpu_startup
-	.globl sun4d_cpu_startup
-
-	.align 4
-
 /* When we start up a cpu for the first time it enters this routine.
  * This initializes the chip from whatever state the prom left it
  * in and sets PIL in %psr to 15, no irqs.
  */
-
-sun4m_cpu_startup:
-cpu1_startup:
-	sethi	%hi(trapbase_cpu1), %g3
-	b	1f
-	 or	%g3, %lo(trapbase_cpu1), %g3
-
-cpu2_startup:
-	sethi	%hi(trapbase_cpu2), %g3
-	b	1f
-	 or	%g3, %lo(trapbase_cpu2), %g3
-
-cpu3_startup:
-	sethi	%hi(trapbase_cpu3), %g3
-	b	1f
-	 or	%g3, %lo(trapbase_cpu3), %g3
-
-1:
-	/* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */
-	set	(PSR_PIL | PSR_S | PSR_PS), %g1
-	wr	%g1, 0x0, %psr		! traps off though
-	WRITE_PAUSE
-
-	/* Our %wim is one behind CWP */
-	mov	2, %g1
-	wr	%g1, 0x0, %wim
-	WRITE_PAUSE
-
-	/* This identifies "this cpu". */
-	wr	%g3, 0x0, %tbr
-	WRITE_PAUSE
-
-	/* Give ourselves a stack and curptr. */
-	set	current_set, %g5
-	srl	%g3, 10, %g4
-	and	%g4, 0xc, %g4
-	ld	[%g5 + %g4], %g6
-
-	sethi	%hi(THREAD_SIZE - STACKFRAME_SZ), %sp
-	or	%sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp
-	add	%g6, %sp, %sp
-
-	/* Turn on traps (PSR_ET). */
-	rd	%psr, %g1
-	wr	%g1, PSR_ET, %psr	! traps on
-	WRITE_PAUSE
-
-	/* Init our caches, etc. */
-	set	poke_srmmu, %g5
-	ld	[%g5], %g5
-	call	%g5
-	 nop
-
-	/* Start this processor. */
-	call	smp_callin
-	 nop
-
-	b,a	smp_panic
-
 	.text
 	.align	4
-
-smp_panic:
-	call	cpu_panic
-	 nop
-
-/* CPUID in bootbus can be found at PA 0xff0140000 */
-#define SUN4D_BOOTBUS_CPUID	0xf0140000
-
-	.align	4
-
-sun4d_cpu_startup:
-	/* Set up a sane %psr -- PIL<0xf> S<0x1> PS<0x1> CWP<0x0> */
-	set	(PSR_PIL | PSR_S | PSR_PS), %g1
-	wr	%g1, 0x0, %psr		! traps off though
-	WRITE_PAUSE
-
-	/* Our %wim is one behind CWP */
-	mov	2, %g1
-	wr	%g1, 0x0, %wim
-	WRITE_PAUSE
-
-	/* Set tbr - we use just one trap table. */
-	set	trapbase, %g1
-	wr	%g1, 0x0, %tbr
-	WRITE_PAUSE
-
-	/* Get our CPU id out of bootbus */
-	set	SUN4D_BOOTBUS_CPUID, %g3
-	lduba	[%g3] ASI_M_CTL, %g3
-	and	%g3, 0xf8, %g3
-	srl	%g3, 3, %g1
-	sta	%g1, [%g0] ASI_M_VIKING_TMP1
-
-	/* Give ourselves a stack and curptr. */
-	set	current_set, %g5
-	srl	%g3, 1, %g4
-	ld	[%g5 + %g4], %g6
-
-	sethi	%hi(THREAD_SIZE - STACKFRAME_SZ), %sp
-	or	%sp, %lo(THREAD_SIZE - STACKFRAME_SZ), %sp
-	add	%g6, %sp, %sp
-
-	/* Turn on traps (PSR_ET). */
-	rd	%psr, %g1
-	wr	%g1, PSR_ET, %psr	! traps on
-	WRITE_PAUSE
-
-	/* Init our caches, etc. */
-	set	poke_srmmu, %g5
-	ld	[%g5], %g5
-	call	%g5
-	 nop
-
-	/* Start this processor. */
-	call	smp_callin
-	 nop
-
-	b,a	smp_panic
-
-	.align	4
         .global leon_smp_cpu_startup, smp_penguin_ctable
 
 leon_smp_cpu_startup:
@@ -198,4 +74,5 @@ leon_smp_cpu_startup:
 	call	smp_callin
 	 nop
 
-	b,a	smp_panic
+	b,a	cpu_panic
+	 nop

-- 
2.34.1