From e7bae8283fea94cf470542916a063182c9e5771a Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 15 Mar 2021 18:00:23 +1300 Subject: [PATCH] x86: Allow installing an e820 when booting from coreboot Move this code into a generic location so that it can be used by other x86 boards which want to boot from coreboot. Also ensure that this is called if booting from coreboot. Signed-off-by: Simon Glass --- arch/x86/cpu/coreboot/sdram.c | 27 +------------------- arch/x86/include/asm/e820.h | 16 +++++++++++- arch/x86/lib/coreboot/Makefile | 1 + arch/x86/lib/coreboot/cb_support.c | 41 ++++++++++++++++++++++++++++++ arch/x86/lib/zimage.c | 13 ++++++++-- 5 files changed, 69 insertions(+), 29 deletions(-) create mode 100644 arch/x86/lib/coreboot/cb_support.c diff --git a/arch/x86/cpu/coreboot/sdram.c b/arch/x86/cpu/coreboot/sdram.c index 43604ee837..4a256bad44 100644 --- a/arch/x86/cpu/coreboot/sdram.c +++ b/arch/x86/cpu/coreboot/sdram.c @@ -16,32 +16,7 @@ DECLARE_GLOBAL_DATA_PTR; unsigned int install_e820_map(unsigned int max_entries, struct e820_entry *entries) { - unsigned int num_entries; - int i; - - num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries); - if (num_entries < lib_sysinfo.n_memranges) { - printf("Warning: Limiting e820 map to %d entries.\n", - num_entries); - } - for (i = 0; i < num_entries; i++) { - struct memrange *memrange = &lib_sysinfo.memrange[i]; - - entries[i].addr = memrange->base; - entries[i].size = memrange->size; - - /* - * coreboot has some extensions (type 6 & 16) to the E820 types. - * When we detect this, mark it as E820_RESERVED. - */ - if (memrange->type == CB_MEM_VENDOR_RSVD || - memrange->type == CB_MEM_TABLE) - entries[i].type = E820_RESERVED; - else - entries[i].type = memrange->type; - } - - return num_entries; + return cb_install_e820_map(max_entries, entries); } /* diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h index a66c0d2489..850a0a7a89 100644 --- a/arch/x86/include/asm/e820.h +++ b/arch/x86/include/asm/e820.h @@ -22,9 +22,23 @@ struct e820_entry { #define ISA_START_ADDRESS 0xa0000 #define ISA_END_ADDRESS 0x100000 -/* Implementation defined function to install an e820 map */ +/* Implementation-defined function to install an e820 map */ unsigned int install_e820_map(unsigned int max_entries, struct e820_entry *); + +/** + * cb_install_e820_map() - Install e820 map provided by coreboot sysinfo + * + * This should be used when booting from coreboot, since in that case the + * memory areas are provided by coreboot in its sysinfo. + * + * @max_entries: Maximum number of entries to write + * @entries: Place to put entires + * @return number of entries written + */ +unsigned int cb_install_e820_map(unsigned int max_entries, + struct e820_entry *entries); + #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_E820_H */ diff --git a/arch/x86/lib/coreboot/Makefile b/arch/x86/lib/coreboot/Makefile index b5250d916b..cb0ae1d017 100644 --- a/arch/x86/lib/coreboot/Makefile +++ b/arch/x86/lib/coreboot/Makefile @@ -4,3 +4,4 @@ # obj-y += cb_sysinfo.o +obj-y += cb_support.o diff --git a/arch/x86/lib/coreboot/cb_support.c b/arch/x86/lib/coreboot/cb_support.c new file mode 100644 index 0000000000..ebb45cdfb5 --- /dev/null +++ b/arch/x86/lib/coreboot/cb_support.c @@ -0,0 +1,41 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Support for booting from coreboot + * + * Copyright 2021 Google LLC + */ + +#include +#include +#include + +unsigned int cb_install_e820_map(unsigned int max_entries, + struct e820_entry *entries) +{ + unsigned int num_entries; + int i; + + num_entries = min((unsigned int)lib_sysinfo.n_memranges, max_entries); + if (num_entries < lib_sysinfo.n_memranges) { + printf("Warning: Limiting e820 map to %d entries\n", + num_entries); + } + for (i = 0; i < num_entries; i++) { + struct memrange *memrange = &lib_sysinfo.memrange[i]; + + entries[i].addr = memrange->base; + entries[i].size = memrange->size; + + /* + * coreboot has some extensions (type 6 & 16) to the E820 types. + * When we detect this, mark it as E820_RESERVED. + */ + if (memrange->type == CB_MEM_VENDOR_RSVD || + memrange->type == CB_MEM_TABLE) + entries[i].type = E820_RESERVED; + else + entries[i].type = memrange->type; + } + + return num_entries; +} diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c index 602788e016..90fc8a466d 100644 --- a/arch/x86/lib/zimage.c +++ b/arch/x86/lib/zimage.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -28,6 +29,7 @@ #include #include #include +#include #ifdef CONFIG_SYS_COREBOOT #include #endif @@ -35,6 +37,8 @@ #include #include +DECLARE_GLOBAL_DATA_PTR; + /* * Memory lay-out: * @@ -309,8 +313,13 @@ int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot, int bootproto = get_boot_protocol(hdr, false); log_debug("Setup E820 entries\n"); - setup_base->e820_entries = install_e820_map( - ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); + if (ll_boot_init()) { + setup_base->e820_entries = install_e820_map( + ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); + } else if (IS_ENABLED(CONFIG_COREBOOT_SYSINFO)) { + setup_base->e820_entries = cb_install_e820_map( + ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); + } if (bootproto == 0x0100) { setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; -- 2.39.5