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efi/libstub: Descriptions for stub helper functions

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Provide missing descriptions for EFI stub helper functions.
Adjust formatting of existing descriptions to kernel style.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Link: https://lore.kernel.org/r/20200615234231.21059-1-xypron.glpk@gmx.de
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Heinrich Schuchardt 2020-06-16 01:42:31 +02:00 committed by Ard Biesheuvel
parent 7a88a6227d
commit 8c0a839c2b
2 changed files with 75 additions and 13 deletions
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78
drivers/firmware/efi/libstub/efi-stub-helper.c
View File

@ -32,6 +32,10 @@ bool __pure __efi_soft_reserve_enabled(void)
return !efi_nosoftreserve;
}
/**
* efi_char16_puts() - Write a UCS-2 encoded string to the console
* @str: UCS-2 encoded string
*/
void efi_char16_puts(efi_char16_t *str)
{
efi_call_proto(efi_table_attr(efi_system_table, con_out),
@ -83,6 +87,10 @@ u32 utf8_to_utf32(const u8 **s8)
return c32;
}
/**
* efi_puts() - Write a UTF-8 encoded string to the console
* @str: UTF-8 encoded string
*/
void efi_puts(const char *str)
{
efi_char16_t buf[128];
@ -113,6 +121,16 @@ void efi_puts(const char *str)
}
}
/**
* efi_printk() - Print a kernel message
* @fmt: format string
*
* The first letter of the format string is used to determine the logging level
* of the message. If the level is less then the current EFI logging level, the
* message is suppressed. The message will be truncated to 255 bytes.
*
* Return: number of printed characters
*/
int efi_printk(const char *fmt, ...)
{
char printf_buf[256];
@ -154,13 +172,18 @@ int efi_printk(const char *fmt, ...)
return printed;
}
/*
* Parse the ASCII string 'cmdline' for EFI options, denoted by the efi=
/**
* efi_parse_options() - Parse EFI command line options
* @cmdline: kernel command line
*
* Parse the ASCII string @cmdline for EFI options, denoted by the efi=
* option, e.g. efi=nochunk.
*
* It should be noted that efi= is parsed in two very different
* environments, first in the early boot environment of the EFI boot
* stub, and subsequently during the kernel boot.
*
* Return: status code
*/
efi_status_t efi_parse_options(char const *cmdline)
{
@ -286,13 +309,21 @@ char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len)
return (char *)cmdline_addr;
}
/*
/**
* efi_exit_boot_services() - Exit boot services
* @handle: handle of the exiting image
* @map: pointer to receive the memory map
* @priv: argument to be passed to @priv_func
* @priv_func: function to process the memory map before exiting boot services
*
* Handle calling ExitBootServices according to the requirements set out by the
* spec. Obtains the current memory map, and returns that info after calling
* ExitBootServices. The client must specify a function to perform any
* processing of the memory map data prior to ExitBootServices. A client
* specific structure may be passed to the function via priv. The client
* function may be called multiple times.
*
* Return: status code
*/
efi_status_t efi_exit_boot_services(void *handle,
struct efi_boot_memmap *map,
@ -361,6 +392,11 @@ fail:
return status;
}
/**
* get_efi_config_table() - retrieve UEFI configuration table
* @guid: GUID of the configuration table to be retrieved
* Return: pointer to the configuration table or NULL
*/
void *get_efi_config_table(efi_guid_t guid)
{
unsigned long tables = efi_table_attr(efi_system_table, tables);
@ -408,17 +444,18 @@ static const struct {
};
/**
* efi_load_initrd_dev_path - load the initrd from the Linux initrd device path
* efi_load_initrd_dev_path() - load the initrd from the Linux initrd device path
* @load_addr: pointer to store the address where the initrd was loaded
* @load_size: pointer to store the size of the loaded initrd
* @max: upper limit for the initrd memory allocation
* @return: %EFI_SUCCESS if the initrd was loaded successfully, in which
* case @load_addr and @load_size are assigned accordingly
* %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd
* device path
* %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL
* %EFI_OUT_OF_RESOURCES if memory allocation failed
* %EFI_LOAD_ERROR in all other cases
*
* Return:
* * %EFI_SUCCESS if the initrd was loaded successfully, in which
* case @load_addr and @load_size are assigned accordingly
* * %EFI_NOT_FOUND if no LoadFile2 protocol exists on the initrd device path
* * %EFI_INVALID_PARAMETER if load_addr == NULL or load_size == NULL
* * %EFI_OUT_OF_RESOURCES if memory allocation failed
* * %EFI_LOAD_ERROR in all other cases
*/
static
efi_status_t efi_load_initrd_dev_path(unsigned long *load_addr,
@ -481,6 +518,16 @@ efi_status_t efi_load_initrd_cmdline(efi_loaded_image_t *image,
load_addr, load_size);
}
/**
* efi_load_initrd() - Load initial RAM disk
* @image: EFI loaded image protocol
* @load_addr: pointer to loaded initrd
* @load_size: size of loaded initrd
* @soft_limit: preferred size of allocated memory for loading the initrd
* @hard_limit: minimum size of allocated memory
*
* Return: status code
*/
efi_status_t efi_load_initrd(efi_loaded_image_t *image,
unsigned long *load_addr,
unsigned long *load_size,
@ -505,6 +552,15 @@ efi_status_t efi_load_initrd(efi_loaded_image_t *image,
return status;
}
/**
* efi_wait_for_key() - Wait for key stroke
* @usec: number of microseconds to wait for key stroke
* @key: key entered
*
* Wait for up to @usec microseconds for a key stroke.
*
* Return: status code, EFI_SUCCESS if key received
*/
efi_status_t efi_wait_for_key(unsigned long usec, efi_input_key_t *key)
{
efi_event_t events[2], timer;

10
drivers/firmware/efi/libstub/efistub.h
View File

@ -157,8 +157,14 @@ typedef void (__efiapi *efi_event_notify_t)(efi_event_t, void *);
#define EFI_EVT_NOTIFY_WAIT 0x00000100U
#define EFI_EVT_NOTIFY_SIGNAL 0x00000200U
/*
* boottime->wait_for_event takes an array of events as input.
/**
* efi_set_event_at() - add event to events array
*
* @events: array of UEFI events
* @ids: index where to put the event in the array
* @event: event to add to the aray
*
* boottime->wait_for_event() takes an array of events as input.
* Provide a helper to set it up correctly for mixed mode.
*/
static inline