From patchwork Tue Dec 19 22:03:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Ravnborg via B4 Relay X-Patchwork-Id: 756257 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E56CD3D0A2; Tue, 19 Dec 2023 22:03:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="bsS3EAtY" Received: by smtp.kernel.org (Postfix) with ESMTPS id 8D939C433C9; Tue, 19 Dec 2023 22:03:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1703023395; bh=psyCk22duUzejSuxF1TPk2sjNUuqcZ3MiQrJ6SWEwzo=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=bsS3EAtYpQUMnskqZpm4J3KJB+bEEzfKIG0rcM850es8822sKmWpirk/DPHMkHJuc UvN+0DIOVXOBvAMF2fmJxsn9nBMkkJtk7B5+YR1LqNt0eHqf/PH2Q5BFjAYU5fbpDQ M2LSut243lWfuyF0q3fuOGV4fAPGrR/SHIaPIwhzFNetpWLgbEstEzsGv14aBUC6vW l4HTjhIDSuQChNeOomPXGckwacwuTLvNICtxCtpjbR5dXSyuK1P1OPh5JmTp5/TBxC /zQ10n+z7Qlb3+rq+7ITijhA2gmgIaSbv+r2ynlJZilnezFu5VK3UzEMTriLjhLglE ozQHD/UD8L4Qw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 733ACC41535; Tue, 19 Dec 2023 22:03:15 +0000 (UTC) From: Sam Ravnborg via B4 Relay Date: Tue, 19 Dec 2023 23:03:07 +0100 Subject: [PATCH 02/27] sparc32: Drop sun4m/sun4d support from head_32.S Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231219-sam-sparc32-sunset-v3-v1-2-64bb44b598c5@ravnborg.org> References: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org> In-Reply-To: <20231219-sam-sparc32-sunset-v3-v1-0-64bb44b598c5@ravnborg.org> To: "David S. Miller" , Arnd Bergmann , Andreas Larsson Cc: Helge Deller , Alexander Viro , Greg Kroah-Hartman , Alan Stern , Jaroslav Kysela , Takashi Iwai , sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-sound@vger.kernel.org, Sam Ravnborg X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=ed25519-sha256; t=1703023392; l=7424; i=sam@ravnborg.org; s=20230107; h=from:subject:message-id; bh=zGUMWu9MQ9KHsVNvKkdc58EXjHHT/TR1xXu3Hy+1rPk=; =?utf-8?q?b=3DaCRrE/LENgA1?= =?utf-8?q?7AXMbL3TH4Y5r4h7A/M7zknBKhnwBcLg2utmf7eKBaWWxz4qf9awup61DHk1lLDN?= bcCspi7IDeFeKCgDzJgsZtZMdkGBoWMIIUowSqcJrdRTmVHRFDeY X-Developer-Key: i=sam@ravnborg.org; a=ed25519; pk=R0+pqV7BRYOAeOIGkyOrSNke7arx5y3LkEuNi37YEyU= X-Endpoint-Received: by B4 Relay for sam@ravnborg.org/20230107 with auth_id=22 X-Original-From: Sam Ravnborg Reply-To: From: Sam Ravnborg Remove the most obvious parts of sun4* support from head_32.S. Use a single print if a sun4* machine is detected thus restricting boots to LEON machines. Signed-off-by: Sam Ravnborg Cc: "David S. Miller" Cc: Arnd Bergmann Cc: Andreas Larsson --- arch/sparc/kernel/head_32.S | 190 +++----------------------------------------- 1 file changed, 9 insertions(+), 181 deletions(-) diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S index 964c61b5cd03..03dc232dd235 100644 --- a/arch/sparc/kernel/head_32.S +++ b/arch/sparc/kernel/head_32.S @@ -45,11 +45,7 @@ cputypvar: .align 4 notsup: - .asciz "Sparc-Linux sun4/sun4c or MMU-less not supported\n\n" - .align 4 - -sun4e_notsup: - .asciz "Sparc-Linux sun4e support does not exist\n\n" + .asciz "This kernel only supports LEON SPARC V8\n\n" .align 4 /* The trap-table - located in the __HEAD section */ @@ -215,114 +211,10 @@ not_a_sun4: be leon_remap /* It is a LEON - jump */ nop - /* Sanity-check, is MMU enabled */ - lda [%g0] ASI_M_MMUREGS, %g1 - andcc %g1, 1, %g0 - be halt_notsup - nop - - /* Check for a viking (TI) module. */ - cmp %g3, PSR_IMPL_TI - bne srmmu_not_viking - nop - - /* Figure out what kind of viking we are on. - * We need to know if we have to play with the - * AC bit and disable traps or not. - */ - - /* I've only seen MicroSparc's on SparcClassics with this - * bit set. - */ - set 0x800, %g2 - lda [%g0] ASI_M_MMUREGS, %g3 ! peek in the control reg - and %g2, %g3, %g3 - subcc %g3, 0x0, %g0 - bnz srmmu_not_viking ! is in mbus mode - nop - - rd %psr, %g3 ! DO NOT TOUCH %g3 - andn %g3, PSR_ET, %g2 - wr %g2, 0x0, %psr - WRITE_PAUSE - - /* Get context table pointer, then convert to - * a physical address, which is 36 bits. - */ - set AC_M_CTPR, %g4 - lda [%g4] ASI_M_MMUREGS, %g4 - sll %g4, 0x4, %g4 ! We use this below - ! DO NOT TOUCH %g4 - - /* Set the AC bit in the Viking's MMU control reg. */ - lda [%g0] ASI_M_MMUREGS, %g5 ! DO NOT TOUCH %g5 - set 0x8000, %g6 ! AC bit mask - or %g5, %g6, %g6 ! Or it in... - sta %g6, [%g0] ASI_M_MMUREGS ! Close your eyes... - - /* Grrr, why does it seem like every other load/store - * on the sun4m is in some ASI space... - * Fine with me, let's get the pointer to the level 1 - * page table directory and fetch its entry. - */ - lda [%g4] ASI_M_BYPASS, %o1 ! This is a level 1 ptr - srl %o1, 0x4, %o1 ! Clear low 4 bits - sll %o1, 0x8, %o1 ! Make physical - - /* Ok, pull in the PTD. */ - lda [%o1] ASI_M_BYPASS, %o2 ! This is the 0x0 16MB pgd - - /* Calculate to KERNBASE entry. */ - add %o1, KERNBASE >> (PGDIR_SHIFT - 2), %o3 - - /* Poke the entry into the calculated address. */ - sta %o2, [%o3] ASI_M_BYPASS - - /* I don't get it Sun, if you engineered all these - * boot loaders and the PROM (thank you for the debugging - * features btw) why did you not have them load kernel - * images up in high address space, since this is necessary - * for ABI compliance anyways? Does this low-mapping provide - * enhanced interoperability? - * - * "The PROM is the computer." - */ - - /* Ok, restore the MMU control register we saved in %g5 */ - sta %g5, [%g0] ASI_M_MMUREGS ! POW... ouch - - /* Turn traps back on. We saved it in %g3 earlier. */ - wr %g3, 0x0, %psr ! tick tock, tick tock - - /* Now we burn precious CPU cycles due to bad engineering. */ - WRITE_PAUSE - - /* Wow, all that just to move a 32-bit value from one - * place to another... Jump to high memory. - */ - b go_to_highmem + /* Not LEON - halt */ + ba halt_notsup nop -srmmu_not_viking: - /* This works on viking's in Mbus mode and all - * other MBUS modules. It is virtually the same as - * the above madness sans turning traps off and flipping - * the AC bit. - */ - set AC_M_CTPR, %g1 - lda [%g1] ASI_M_MMUREGS, %g1 ! get ctx table ptr - sll %g1, 0x4, %g1 ! make physical addr - lda [%g1] ASI_M_BYPASS, %g1 ! ptr to level 1 pg_table - srl %g1, 0x4, %g1 - sll %g1, 0x8, %g1 ! make phys addr for l1 tbl - - lda [%g1] ASI_M_BYPASS, %g2 ! get level1 entry for 0x0 - add %g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3 - sta %g2, [%g3] ASI_M_BYPASS ! place at KERNBASE entry - b go_to_highmem - nop ! wheee.... - - leon_remap: /* Sanity-check, is MMU enabled */ lda [%g0] ASI_LEON_MMUREGS, %g1 @@ -343,8 +235,6 @@ leon_remap: lda [%g1] ASI_M_BYPASS, %g2 ! get level1 entry for 0x0 add %g1, KERNBASE >> (PGDIR_SHIFT - 2), %g3 sta %g2, [%g3] ASI_M_BYPASS ! place at KERNBASE entry - b go_to_highmem - nop ! wheee.... /* Now do a non-relative jump so that PC is in high-memory */ go_to_highmem: @@ -413,13 +303,13 @@ execute_in_high_mem: ldub [%o2 + 0x4], %l1 cmp %l1, 'm' - be sun4m_init + be no_sun4_here ! sun4m cmp %l1, 's' - be sun4m_init + be no_sun4_here ! sun4m cmp %l1, 'd' - be sun4d_init + be no_sun4_here ! sun4d cmp %l1, 'e' - be no_sun4e_here ! Could be a sun4e. + be no_sun4_here ! Could be a sun4e. nop b no_sun4u_here ! AIEEE, a V9 sun4u... Get our BIG BROTHER kernel :)) nop @@ -441,68 +331,6 @@ leon_init: /* Update boot_cpu_id only on boot cpu */ stub %g1, [%g2 + %lo(boot_cpu_id)] - ba continue_boot - nop - -/* CPUID in bootbus can be found at PA 0xff0140000 */ -#define SUN4D_BOOTBUS_CPUID 0xf0140000 - -sun4d_init: - /* Need to patch call to handler_irq */ - set patch_handler_irq, %g4 - set sun4d_handler_irq, %g5 - sethi %hi(0x40000000), %g3 ! call - sub %g5, %g4, %g5 - srl %g5, 2, %g5 - or %g5, %g3, %g5 - st %g5, [%g4] - -#ifdef CONFIG_SMP - /* 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, %g4 - sta %g4, [%g0] ASI_M_VIKING_TMP1 - sethi %hi(boot_cpu_id), %g5 - stb %g4, [%g5 + %lo(boot_cpu_id)] -#endif - - /* Fall through to sun4m_init */ - -sun4m_init: -/* Ok, the PROM could have done funny things and apple cider could still - * be sitting in the fault status/address registers. Read them all to - * clear them so we don't get magic faults later on. - */ -/* This sucks, apparently this makes Vikings call prom panic, will fix later */ -2: - rd %psr, %o1 - srl %o1, PSR_IMPL_SHIFT, %o1 ! Get a type of the CPU - - subcc %o1, PSR_IMPL_TI, %g0 ! TI: Viking or MicroSPARC - be continue_boot - nop - - set AC_M_SFSR, %o0 - lda [%o0] ASI_M_MMUREGS, %g0 - set AC_M_SFAR, %o0 - lda [%o0] ASI_M_MMUREGS, %g0 - - /* Fujitsu MicroSPARC-II has no asynchronous flavors of FARs */ - subcc %o1, 0, %g0 - be continue_boot - nop - - set AC_M_AFSR, %o0 - lda [%o0] ASI_M_MMUREGS, %g0 - set AC_M_AFAR, %o0 - lda [%o0] ASI_M_MMUREGS, %g0 - nop - - -continue_boot: - /* Aieee, now set PC and nPC, enable traps, give ourselves a stack and it's * show-time! */ @@ -670,9 +498,9 @@ continue_boot: call halt_me nop -no_sun4e_here: +no_sun4_here: ld [%g7 + 0x68], %o1 - set sun4e_notsup, %o0 + set notsup, %o0 call %o1 nop b halt_me