Provide an iterator to go through boot module array searching based on type.
Signed-off-by: Daniel P. Smith <[email protected]> --- Changes since v5: - documented help next_boot_module_index - switch to unsigned int for next_boot_module_index - changes identified that BOOTMOD_XEN was not supported, so added support --- xen/arch/x86/include/asm/bootinfo.h | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/include/asm/bootinfo.h b/xen/arch/x86/include/asm/bootinfo.h index 5862054b8cef..3010e6f4af9c 100644 --- a/xen/arch/x86/include/asm/bootinfo.h +++ b/xen/arch/x86/include/asm/bootinfo.h @@ -62,8 +62,35 @@ struct boot_info { struct boot_module mods[MAX_NR_BOOTMODS + 1]; }; -#endif /* __XEN_X86_BOOTINFO_H__ */ +/* + * next_boot_module_index: + * Finds the next boot module of type t, starting at array index start. + * + * Returns: + * Success - index in boot_module array + * Failure - a value greater than MAX_NR_BOOTMODS + */ +static inline unsigned int __init next_boot_module_index( + const struct boot_info *bi, enum bootmod_type t, unsigned int start) +{ + unsigned int i; + + if ( t == BOOTMOD_XEN ) + return MAX_NR_BOOTMODS; + for ( i = start; i < bi->nr_modules; i++ ) + { + if ( bi->mods[i].type == t ) + return i; + } + + return MAX_NR_BOOTMODS + 1; +} + +#define first_boot_module_index(bi, t) \ + next_boot_module_index(bi, t, 0) + +#endif /* __XEN_X86_BOOTINFO_H__ */ /* * Local variables: * mode: C -- 2.30.2
