diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/fbos/dt.h | 20 | ||||
| -rw-r--r-- | include/fbos/init.h | 7 |
2 files changed, 21 insertions, 6 deletions
diff --git a/include/fbos/dt.h b/include/fbos/dt.h index fd77c35..bbeb7cd 100644 --- a/include/fbos/dt.h +++ b/include/fbos/dt.h @@ -3,13 +3,21 @@ #include <fbos/compiler.h> -// Pair of addresses where the initrd is located in memory. -struct initrd_addr { - uintptr_t start; - uintptr_t end; +// Default value for the 'dt_info.cpu_freq' property if none could be retrieved. +#define DEFAULT_CPU_FREQ 10000000 + +// Holds all the information that we gather from the initial DeviceTree blob. +struct dt_info { + // Ticks per second. If `get_dt_info` fails at setting this value, then + // `DEFAULT_CPU_FREQ` is used. + uint64_t cpu_freq; + + // Start and end addresses of the initramfs blob as stored in memory. + uintptr_t initrd_start; + uintptr_t initrd_end; }; -// Returns the `initrd` addresses as parsed from the given DTB blob. -struct initrd_addr find_dt_initrd_addr(uint32_t *dtb); +// Set 'info' by parsing the given 'dtb' blob. +void get_dt_info(uint32_t *dtb, struct dt_info *info); #endif // __FBOS_DT_H_ diff --git a/include/fbos/init.h b/include/fbos/init.h index f0f1dce..9e0049e 100644 --- a/include/fbos/init.h +++ b/include/fbos/init.h @@ -2,6 +2,7 @@ #define __FBOS_INIT_H #include <fbos/compiler.h> +#include <fbos/dt.h> #include <fbos/sched.h> // Tracks the amount of seconds that have elapsed since activating timer @@ -10,6 +11,12 @@ // Instantiated in kernel/trap.c, initialized in main.c. extern uint64_t seconds_elapsed; +// General information from the DTB blob. This will be properly initialized at +// the very beginning of kernel initialization. +// +// Instantiated and initialized in kernel/main.c. +extern struct dt_info info; + // Extract the executables from the initrd that is located at `base_addr` and // has the given `size`. void extract_initrd(const unsigned char *const base_addr, uint64_t size, |