From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chao Fan Subject: [PATCH v11 3/5] x86/boot: Add get_acpi_rsdp() to parse RSDP in cmdlien from kexec Date: Mon, 12 Nov 2018 17:46:43 +0800 Message-ID: <20181112094645.4879-4-fanc.fnst@cn.fujitsu.com> References: <20181112094645.4879-1-fanc.fnst@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: In-Reply-To: <20181112094645.4879-1-fanc.fnst@cn.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-efi@vger.kernel.org, linux-acpi@vger.kernel.org, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, keescook@chromium.org, bhe@redhat.com, msys.mizuma@gmail.com Cc: indou.takao@jp.fujitsu.com, caoj.fnst@cn.fujitsu.com, fanc.fnst@cn.fujitsu.com List-Id: linux-acpi@vger.kernel.org Imitate setup_acpi_rsdp() for the early_param of 'acpi_rsdp'. KEXEC writes the RSDP pointer to cmdline for EFI booting. So if 'acpi_rsdp' found in cmdline, use it directely. Since function kstrtoull() is needed, include it in arch/x86/boot/string.h. To solve the definition conflict problem, set BOOT_STRING tag to expose only kstrtoull() and functions used by it. Other functions in lib/kstrtox.c will be covered. Signed-off-by: Chao Fan --- arch/x86/boot/compressed/acpitb.c | 26 ++++++++++++++++++++++++++ arch/x86/boot/string.h | 4 ++++ lib/kstrtox.c | 4 ++++ 3 files changed, 34 insertions(+) diff --git a/arch/x86/boot/compressed/acpitb.c b/arch/x86/boot/compressed/acpitb.c index 50fa65cf824d..5cfb4efa5a19 100644 --- a/arch/x86/boot/compressed/acpitb.c +++ b/arch/x86/boot/compressed/acpitb.c @@ -8,6 +8,12 @@ #include #include +#define STATIC +#include + +#define BOOT_STRING +#include "../string.h" + /* Search EFI table for RSDP table. */ static void efi_get_rsdp_addr(acpi_physical_address *rsdp_addr) { @@ -200,3 +206,23 @@ static void bios_get_rsdp_addr(acpi_physical_address *rsdp_addr) *rsdp_addr = (acpi_physical_address)address; } } + +static void get_acpi_rsdp(acpi_physical_address *rsdp_addr) +{ +#ifdef CONFIG_KEXEC + unsigned long long res; + int len = 0; + char *val; + + val = malloc(19); + len = cmdline_find_option("acpi_rsdp", val, 19); + + if (len == -1) + return; + + if (len > 0) { + val[len] = 0; + *rsdp_addr = (acpi_physical_address)kstrtoull(val, 16, &res); + } +#endif +} diff --git a/arch/x86/boot/string.h b/arch/x86/boot/string.h index 3d78e27077f4..0ff3edb888e4 100644 --- a/arch/x86/boot/string.h +++ b/arch/x86/boot/string.h @@ -30,3 +30,7 @@ extern unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base); #endif /* BOOT_STRING_H */ + +#ifdef BOOT_STRING +#include "../../../lib/kstrtox.c" +#endif diff --git a/lib/kstrtox.c b/lib/kstrtox.c index 1006bf70bf74..3804db9eed56 100644 --- a/lib/kstrtox.c +++ b/lib/kstrtox.c @@ -126,6 +126,8 @@ int kstrtoull(const char *s, unsigned int base, unsigned long long *res) } EXPORT_SYMBOL(kstrtoull); +#ifndef BOOT_STRING + /** * kstrtoll - convert a string to a long long * @s: The start of the string. The string must be null-terminated, and may also @@ -408,3 +410,5 @@ kstrto_from_user(kstrtou16_from_user, kstrtou16, u16); kstrto_from_user(kstrtos16_from_user, kstrtos16, s16); kstrto_from_user(kstrtou8_from_user, kstrtou8, u8); kstrto_from_user(kstrtos8_from_user, kstrtos8, s8); + +#endif -- 2.19.1