a5fd0d184a
The init infrastructure, found in `init.h`, is currently used by:
- `SYS_INIT`: to call functions before `main`
- `DEVICE_*`: to initialize devices
They are all sorted according to an initialization level + a priority.
`SYS_INIT` calls are really orthogonal to devices, however, the required
function signature requires a `const struct device *dev` as a first
argument. The only reason for that is because the same init machinery is
used by devices, so we have something like:
```c
struct init_entry {
int (*init)(const struct device *dev);
/* only set by DEVICE_*, otherwise NULL */
const struct device *dev;
}
```
As a result, we end up with such weird/ugly pattern:
```c
static int my_init(const struct device *dev)
{
/* always NULL! add ARG_UNUSED to avoid compiler warning */
ARG_UNUSED(dev);
...
}
```
This is really a result of poor internals isolation. This patch proposes
a to make init entries more flexible so that they can accept sytem
initialization calls like this:
```c
static int my_init(void)
{
...
}
```
This is achieved using a union:
```c
union init_function {
/* for SYS_INIT, used when init_entry.dev == NULL */
int (*sys)(void);
/* for DEVICE*, used when init_entry.dev != NULL */
int (*dev)(const struct device *dev);
};
struct init_entry {
/* stores init function (either for SYS_INIT or DEVICE*)
union init_function init_fn;
/* stores device pointer for DEVICE*, NULL for SYS_INIT. Allows
* to know which union entry to call.
*/
const struct device *dev;
}
```
This solution **does not increase ROM usage**, and allows to offer clean
public APIs for both SYS_INIT and DEVICE*. Note that however, init
machinery keeps a coupling with devices.
**NOTE**: This is a breaking change! All `SYS_INIT` functions will need
to be converted to the new signature. See the script offered in the
following commit.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
init: convert SYS_INIT functions to the new signature
Conversion scripted using scripts/utils/migrate_sys_init.py.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
manifest: update projects for SYS_INIT changes
Update modules with updated SYS_INIT calls:
- hal_ti
- lvgl
- sof
- TraceRecorderSource
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
tests: devicetree: devices: adjust test
Adjust test according to the recently introduced SYS_INIT
infrastructure.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
tests: kernel: threads: adjust SYS_INIT call
Adjust to the new signature: int (*init_fn)(void);
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
/*
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* Copyright 2022 NXP
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/kernel.h>
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#include <zephyr/sys/printk.h>
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#include <zephyr/device.h>
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#include <zephyr/init.h>
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#if defined(CONFIG_PRINTK) || defined(CONFIG_STDOUT_CONSOLE)
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/**
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* @brief Output one character to SIMULATOR console
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* @param c Character to output
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* @return The character passed as input.
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*/
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static int console_out(int c)
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{
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register unsigned long x0 __asm__("x0") = 8;
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register unsigned long x1 __asm__("x1") = c;
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__asm__ volatile ("hvc #0x4a48\r\n"
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: "+r" (x0), "+r" (x1) : : );
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return c;
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}
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#endif
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#if defined(CONFIG_STDOUT_CONSOLE)
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extern void __stdout_hook_install(int (*hook)(int));
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#else
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#define __stdout_hook_install(x) \
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do {/* nothing */ \
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} while ((0))
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#endif
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#if defined(CONFIG_PRINTK)
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extern void __printk_hook_install(int (*fn)(int));
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#else
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#define __printk_hook_install(x) \
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do {/* nothing */ \
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} while ((0))
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#endif
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/**
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* @brief Initialize the console/debug port
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* @return 0 if successful, otherwise failed.
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*/
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static int jailhouse_console_init(void)
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{
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__stdout_hook_install(console_out);
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__printk_hook_install(console_out);
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return 0;
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}
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SYS_INIT(jailhouse_console_init,
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PRE_KERNEL_1,
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CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
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