diff options
| -rw-r--r-- | stand/liblua/lutils.c | 48 | ||||
| -rw-r--r-- | stand/libsa/Makefile | 2 | ||||
| -rw-r--r-- | stand/libsa/features.c | 56 | ||||
| -rw-r--r-- | stand/libsa/libsa.3 | 60 | ||||
| -rw-r--r-- | stand/libsa/stand.h | 15 | ||||
| -rw-r--r-- | stand/lua/core.lua | 9 | ||||
| -rw-r--r-- | stand/lua/core.lua.8 | 9 |
7 files changed, 197 insertions, 2 deletions
diff --git a/stand/liblua/lutils.c b/stand/liblua/lutils.c index 1792d0c8c620..274d9a39da21 100644 --- a/stand/liblua/lutils.c +++ b/stand/liblua/lutils.c @@ -76,6 +76,25 @@ lua_has_command(lua_State *L) } static int +lua_has_feature(lua_State *L) +{ + const char *feature; + char *msg; + + feature = luaL_checkstring(L, 1); + + if (feature_name_is_enabled(feature)) { + lua_pushboolean(L, 1); + return 1; + } + + lua_pushnil(L); + lua_pushstring(L, "Feature not enabled"); + return 2; +} + + +static int lua_perform(lua_State *L) { int argc; @@ -552,6 +571,7 @@ static const struct luaL_Reg loaderlib[] = { REG_SIMPLE(parse), REG_SIMPLE(getenv), REG_SIMPLE(has_command), + REG_SIMPLE(has_feature), REG_SIMPLE(perform), REG_SIMPLE(printc), /* Also registered as the global 'printc' */ REG_SIMPLE(setenv), @@ -579,6 +599,33 @@ static const struct luaL_Reg iolib[] = { }; #undef REG_SIMPLE +static void +lua_add_feature(void *cookie, const char *name, const char *desc, bool enabled) +{ + lua_State *L = cookie; + + /* + * The feature table consists solely of features that are enabled, and + * their associated descriptions for debugging purposes. + */ + lua_pushstring(L, desc); + lua_setfield(L, -2, name); +} + +static void +lua_add_features(lua_State *L) +{ + + lua_newtable(L); + feature_iter(&lua_add_feature, L); + + /* + * We should still have just the table on the stack after we're done + * iterating. + */ + lua_setfield(L, -2, "features"); +} + int luaopen_loader(lua_State *L) { @@ -592,6 +639,7 @@ luaopen_loader(lua_State *L) lua_setfield(L, -2, "lua_path"); lua_pushinteger(L, bootprog_rev); lua_setfield(L, -2, "version"); + lua_add_features(L); /* Set global printc to loader.printc */ lua_register(L, "printc", lua_printc); return 1; diff --git a/stand/libsa/Makefile b/stand/libsa/Makefile index 57340709873b..a1b9bc32e025 100644 --- a/stand/libsa/Makefile +++ b/stand/libsa/Makefile @@ -13,7 +13,7 @@ LIB?= sa # standalone components and stuff we have modified locally SRCS+= gzguts.h zutil.h __main.c abort.c assert.c bcd.c environment.c \ - getopt.c gets.c globals.c \ + features.c getopt.c gets.c globals.c \ hexdump.c nvstore.c pager.c panic.c printf.c strdup.c strerror.c \ random.c sbrk.c tslog.c twiddle.c zalloc.c zalloc_malloc.c diff --git a/stand/libsa/features.c b/stand/libsa/features.c new file mode 100644 index 000000000000..23dce2b13b60 --- /dev/null +++ b/stand/libsa/features.c @@ -0,0 +1,56 @@ +/*- + * Copyright (c) 2023 Kyle Evans <kevans@FreeBSD.org> + * + * SPDX-License-Identifier: BSD-2-Clause + * + */ + +#include <sys/param.h> + +#include "stand.h" + +static uint32_t loader_features; + +#define FEATURE_ENTRY(name, desc) { FEATURE_##name, #name, desc } +static const struct feature_entry { + uint32_t value; + const char *name; + const char *desc; +} feature_map[] = { + FEATURE_ENTRY(EARLY_ACPI, "Loader probes ACPI in early startup"), +}; + +void +feature_enable(uint32_t mask) +{ + + loader_features |= mask; +} + +bool +feature_name_is_enabled(const char *name) +{ + const struct feature_entry *entry; + + for (size_t i = 0; i < nitems(feature_map); i++) { + entry = &feature_map[i]; + + if (strcmp(entry->name, name) == 0) + return ((loader_features & entry->value) != 0); + } + + return (false); +} + +void +feature_iter(feature_iter_fn *iter_fn, void *cookie) +{ + const struct feature_entry *entry; + + for (size_t i = 0; i < nitems(feature_map); i++) { + entry = &feature_map[i]; + + (*iter_fn)(cookie, entry->name, entry->desc, + (loader_features & entry->value) != 0); + } +} diff --git a/stand/libsa/libsa.3 b/stand/libsa/libsa.3 index a6f30051c8df..7643423b342a 100644 --- a/stand/libsa/libsa.3 +++ b/stand/libsa/libsa.3 @@ -497,6 +497,66 @@ Attempts to open and display the file .Fa fname . Returns -1 on error, 0 at EOF, or 1 if the user elects to quit while reading. .El +.Sh FEATURE SUPPORT +A set of functions are provided to communicate support of features from the +loader binary to the interpreter. +These are used to do something sensible if we are still operating with a loader +binary that behaves differently than expected. +.Bl -hang -width 10n +.It Xo +.Ft void +.Fn feature_enable "uint32_t mask" +.Xc +.Pp +Enable the referenced +.Fa mask +feature, which should be one of the +.Li FEATURE_* +macros defined in +.In stand.h . +.It Xo +.Ft bool +.Fn feature_name_is_enabled "const char *name" +.Xc +.Pp +Check if the referenced +.Fa name +feature is enabled. +The +.Fa name +is usually the same name as the +.Li FEATURE_* +macro, but with the FEATURE_ prefix stripped off. +The authoritative source of feature names is the mapping table near the top in +.Pa stand/libsa/features.c . +.It Xo +.Ft void +.Fn "(feature_iter_fn)" "void *cookie" "const char *name" "const char *desc" "bool enabled" +.Xc +.Pp +The +.Fa cookie +argument is passed as-is from the argument of the same name to +.Fn feature_iter . +The +.Fa name +and +.Fa desc +arguments are defined in the mapping table in +.Pa stand/libsa/features.c . +The +.Fa enabled +argument indicates the current status of the feature, though one could +theoretically turn a feature off in later execution. +As such, this should likely not be trusted if it is needed after the iteration +has finished. +.It Xo +.Ft void +.Fn "feature_iter" "feature_iter_fn *iter_fn" "void *cookie" +.Xc +.Pp +Iterate over the current set of features. +.El .Sh MISC .Bl -hang -width 10n .It Xo diff --git a/stand/libsa/stand.h b/stand/libsa/stand.h index b6ddebb82fd7..f500a8f47847 100644 --- a/stand/libsa/stand.h +++ b/stand/libsa/stand.h @@ -496,6 +496,21 @@ extern void *reallocf(void *, size_t); */ caddr_t ptov(uintptr_t); +/* features.c */ +typedef void (feature_iter_fn)(void *, const char *, const char *, bool); + +extern void feature_enable(uint32_t); +extern bool feature_name_is_enabled(const char *); +extern void feature_iter(feature_iter_fn *, void *); + +/* + * Note that these should also be added to the mapping table in features.c, + * which the interpreter may query to provide details from. The name with + * FEATURE_ removed is assumed to be the name we'll provide in the loader + * features table, just to simplify reasoning about these. + */ +#define FEATURE_EARLY_ACPI 0x0001 + /* hexdump.c */ void hexdump(caddr_t region, size_t len); diff --git a/stand/lua/core.lua b/stand/lua/core.lua index 5c3c65463e51..3a80b0822ca6 100644 --- a/stand/lua/core.lua +++ b/stand/lua/core.lua @@ -378,6 +378,15 @@ function core.boot(argstr) loader.perform(composeLoaderCmd("boot", argstr)) end +function core.hasFeature(name) + if not loader.has_feature then + -- Loader too old, no feature support + return nil, "No feature support in loaded loader" + end + + return loader.has_feature(name) +end + function core.isSingleUserBoot() local single_user = loader.getenv("boot_single") return single_user ~= nil and single_user:lower() == "yes" diff --git a/stand/lua/core.lua.8 b/stand/lua/core.lua.8 index 5274ba4c2143..84447d7632b9 100644 --- a/stand/lua/core.lua.8 +++ b/stand/lua/core.lua.8 @@ -24,7 +24,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.Dd November 20, 2023 +.Dd December 8, 2023 .Dt CORE.LUA 8 .Os .Sh NAME @@ -142,6 +142,13 @@ due to a boot environment change or a potential change in either .Ic kernel or .Ic kernels . +.It Fn core.hasFeature featureName +Checks whether the named +.Fa featureName +is enabled in the current loader. +This is specifically used for detecting capabilities of the loaded loader +binary, so that one can reasonably implement backwards compatibility shims if +needed. .It Fn core.kernelList Returns a table of kernels to display on the boot menu. This will combine |