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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2024 09:43:12.9466 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ee0edfc1-42ce-494b-15ec-08dcbc4583d4 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH1PEPF0000AD74.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6182 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1723628620638116600 Content-Type: text/plain; charset="utf-8" Given no further use in C world of boot_phys_offset, drop it from the argument list of start_xen() and do the necessary changes in the startup code head.S (most notably modifying launch not to expect 2 arguments to pass to C entry point). Both on arm64 and arm32, phys offset (stored in x20 or r10 respectively) is still needed, so that it can be used in e.g. create_table_entry, therefore keep it on the list of common register usage. Signed-off-by: Michal Orzel Acked-by: Julien Grall --- xen/arch/arm/arm32/head.S | 12 +++++------- xen/arch/arm/arm64/head.S | 12 +++++------- xen/arch/arm/setup.c | 3 +-- 3 files changed, 11 insertions(+), 16 deletions(-) diff --git a/xen/arch/arm/arm32/head.S b/xen/arch/arm/arm32/head.S index b488a21a71ba..a96d5d35038f 100644 --- a/xen/arch/arm/arm32/head.S +++ b/xen/arch/arm/arm32/head.S @@ -101,9 +101,8 @@ primary_switched: bl zero_bss PRINT("- Ready -\r\n") /* Setup the arguments for start_xen and jump to C world */ - mov r0, r10 /* r0 :=3D Physical offset */ - mov r1, r8 /* r1 :=3D paddr(FDT) */ - mov_w r2, start_xen + mov r0, r8 /* r0 :=3D paddr(FDT) */ + mov_w r1, start_xen b launch ENDPROC(start) =20 @@ -141,7 +140,7 @@ GLOBAL(init_secondary) secondary_switched: PRINT("- Ready -\r\n") /* Jump to C world */ - mov_w r2, start_secondary + mov_w r1, start_secondary b launch ENDPROC(init_secondary) =20 @@ -243,8 +242,7 @@ ENDPROC(cpu_init) * * Inputs: * r0 : Argument 0 of the C function to call - * r1 : Argument 1 of the C function to call - * r2 : C entry point + * r1 : C entry point * * Clobbers r3 */ @@ -256,7 +254,7 @@ launch: sub sp, #CPUINFO_sizeof /* Make room for CPU save record */ =20 /* Jump to C world */ - bx r2 + bx r1 ENDPROC(launch) =20 /* Fail-stop */ diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S index 2fa07dc3a04b..14c3720d80f8 100644 --- a/xen/arch/arm/arm64/head.S +++ b/xen/arch/arm/arm64/head.S @@ -260,9 +260,8 @@ primary_switched: bl zero_bss PRINT("- Ready -\r\n") /* Setup the arguments for start_xen and jump to C world */ - mov x0, x20 /* x0 :=3D Physical offset */ - mov x1, x21 /* x1 :=3D paddr(FDT) */ - ldr x2, =3Dstart_xen + mov x0, x21 /* x0 :=3D paddr(FDT) */ + ldr x1, =3Dstart_xen b launch END(real_start) =20 @@ -303,7 +302,7 @@ FUNC(init_secondary) secondary_switched: PRINT("- Ready -\r\n") /* Jump to C world */ - ldr x2, =3Dstart_secondary + ldr x1, =3Dstart_secondary b launch END(init_secondary) =20 @@ -407,8 +406,7 @@ END(cpu_init) * * Inputs: * x0 : Argument 0 of the C function to call - * x1 : Argument 1 of the C function to call - * x2 : C entry point + * x1 : C entry point * * Clobbers x3 */ @@ -421,7 +419,7 @@ FUNC_LOCAL(launch) mov sp, x3 =20 /* Jump to C world */ - br x2 + br x1 END(launch) =20 /* Fail-stop */ diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index cfe19e15b0be..961d3ea6700b 100644 --- a/xen/arch/arm/setup.c +++ b/xen/arch/arm/setup.c @@ -287,8 +287,7 @@ void __init init_pdx(void) size_t __read_mostly dcache_line_bytes; =20 /* C entry point for boot CPU */ -void asmlinkage __init start_xen(unsigned long boot_phys_offset, - unsigned long fdt_paddr) +void asmlinkage __init start_xen(unsigned long fdt_paddr) { size_t fdt_size; const char *cmdline; --=20 2.25.1