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Use memory region map to discover the memory

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This commit is contained in:
Kamil Kowalczyk
2025-12-08 01:28:09 +01:00
parent 807f067101
commit 0de8cca8bb
9 changed files with 431 additions and 26 deletions
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6
kernel/mm/make.src
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@@ -2,8 +2,10 @@ dir_mm1 := $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST)))))
c_files += $(dir_mm1)/pmm.c \
$(dir_mm1)/bba.c \
$(dir_mm1)/liballoc.c
$(dir_mm1)/liballoc.c \
$(dir_mm1)/mregmap.c
o_files += $(dir_mm1)/pmm.o \
$(dir_mm1)/bba.o \
$(dir_mm1)/liballoc.o
$(dir_mm1)/liballoc.o \
$(dir_mm1)/mregmap.o

68
kernel/mm/mregmap.c Normal file
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@@ -0,0 +1,68 @@
/*
Copyright 2025 Kamil Kowalczyk
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <libk/types.h>
#include <libk/bitmap.h>
#include <mm/mregmap.h>
static struct mregmap mregmap;
struct mregmap *mregmap_get(void) { return &mregmap; }
void mregmap_init(void) {
bitmap_init(&mregmap.bm, (byte_t *)mregmap.bm_mem, MREGMAP_MAX);
}
bool_t mregmap_add_region(struct mreg *mreg) {
bool_t ret = true;
for (usize_t i = 0; i < MREGMAP_MAX; i++) {
if (!bitmap_test(&mregmap.bm, i)) {
mregmap.mregs[i] = *mreg;
bitmap_set(&mregmap.bm, i);
goto done;
}
}
ret = false;
done:
return ret;
}
struct mreg *mregmap_first_avail(void) {
for (usize_t i = 0; i < MREGMAP_MAX; i++) {
if (mregmap.mregs[i].type == MREG_AVAIL_RAM) {
return &mregmap.mregs[i];
}
}
return NULL;
}

66
kernel/mm/mregmap.h Normal file
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@@ -0,0 +1,66 @@
/*
Copyright 2025 Kamil Kowalczyk
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _MM_MREGMAP_H
#define _MM_MREGMAP_H
#include <libk/types.h>
#include <libk/bitmap.h>
enum {
MREG_AVAIL_RAM = 1, /* available ram */
/* i386 PC */
MREG_I386_PC_RESERVED = 2, /* reserved by hardware/firmware */
MREG_ACPI = 3, /* ACPI info */
MREG_MEM_HBRNT = 4, /* must be preserved in hibernation */
MREG_DEFCT_RMOD = 5, /* defective ram modules */
};
struct mreg {
uptr_t start;
usize_t size;
int type;
};
#define MREGMAP_MAX 256
struct mregmap {
struct mreg mregs[MREGMAP_MAX];
byte_t bm_mem[MREGMAP_MAX];
struct bitmap bm;
};
void mregmap_init(void);
struct mregmap *mregmap_get(void);
bool_t mregmap_add_region(struct mreg *mreg);
struct mreg *mregmap_first_avail(void);
#endif // _MM_MREGMAP_H