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make kernel device frame handling more generic

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The structure actually describes kernel frames and not kernel devices.
In most of the cases a peripherals will fit into one page, but some can
need more pages. On some platform there are no kernel devices at all.
Provides the macro NUM_KERNEL_DEVICE_FRAMES as simple way to find out if
there are mapping that hides the corner cases. This eventually allows
implementing a generic handling even on RISC-V without much overhead, so
the hack for HiFive/Spike can be removed.

Signed-off-by: Axel Heider <axelheider@gmx.de>
This commit is contained in:
Axel Heider
2021-07-05 04:36:47 +02:00
committed by Gerwin Klein
parent cd54bc95e1
commit da0aad0330
5 changed files with 33 additions and 21 deletions
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19
tools/hardware/outputs/c_header.py
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@@ -61,7 +61,7 @@ HEADER_TEMPLATE = '''/*
#ifndef __ASSEMBLER__
{% if len(kernel_regions) > 0 %}
static const kernel_frame_t BOOT_RODATA kernel_devices[] = {
static const kernel_frame_t BOOT_RODATA kernel_device_frames[] = {
{% for group in kernel_regions %}
{% if group.has_macro() %}
{{ group.get_macro() }}
@@ -88,19 +88,30 @@ static const kernel_frame_t BOOT_RODATA kernel_devices[] = {
{% endif %}
{% endfor %}
};
/* Elements in kernel_device_frames may be enabled in specific configurations
* only, but the ARRAY_SIZE() macro will automatically take care of this.
* However, one corner case remains unsolved where all elements are disabled
* and this becomes an empty array effectively. Then the C parser used in the
* formal verification process will fail, because it follows the strict C rules
* which do not allow empty arrays. Luckily, we have not met this case yet...
*/
#define NUM_KERNEL_DEVICE_FRAMES ARRAY_SIZE(kernel_device_frames)
{% else %}
static const kernel_frame_t BOOT_RODATA *const kernel_devices = NULL;
/* The C parser used for formal verification process follows strict C rules,
* which do not allow empty arrays. Thus this is defined as NULL.
*/
static const kernel_frame_t BOOT_RODATA *const kernel_device_frames = NULL;
#define NUM_KERNEL_DEVICE_FRAMES 0
{% endif %}
/* PHYSICAL MEMORY */
static const p_region_t BOOT_RODATA avail_p_regs[] = {
{% for reg in physical_memory %}
/* {{ reg.owner.path }} */
{
/* {{ reg.owner.path }} */
.start = {{ "0x{:x}".format(reg.base) }},
.end = {{ "0x{:x}".format(reg.base + reg.size) }}
},
{% endfor %}
};