new file mode 100644
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_LKL_PAGE_H
+#define _ASM_LKL_PAGE_H
+
+#define CONFIG_KERNEL_RAM_BASE_ADDRESS memory_start
+
+#ifndef __ASSEMBLY__
+void free_mem(void);
+void bootmem_init(unsigned long mem_size);
+#endif
+
+#include <asm-generic/page.h>
+
+#endif /* _ASM_LKL_PAGE_H */
new file mode 100644
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LKL_PGTABLE_H
+#define _LKL_PGTABLE_H
+
+#include <asm-generic/4level-fixup.h>
+
+/*
+ * (C) Copyright 2000-2002, Greg Ungerer <gerg@snapgear.com>
+ */
+
+#include <linux/slab.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+#define pgd_present(pgd) (1)
+#define pgd_none(pgd) (0)
+#define pgd_bad(pgd) (0)
+#define pgd_clear(pgdp)
+#define kern_addr_valid(addr) (1)
+#define pmd_offset(a, b) ((void *)0)
+
+#define PAGE_NONE __pgprot(0)
+#define PAGE_SHARED __pgprot(0)
+#define PAGE_COPY __pgprot(0)
+#define PAGE_READONLY __pgprot(0)
+#define PAGE_KERNEL __pgprot(0)
+
+void paging_init(void);
+#define swapper_pg_dir ((pgd_t *)0)
+
+#define __swp_type(x) (0)
+#define __swp_offset(x) (0)
+#define __swp_entry(typ, off) ((swp_entry_t) { ((typ) | ((off) << 7)) })
+#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
+#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
+
+/*
+ * ZERO_PAGE is a global shared page that is always zero: used
+ * for zero-mapped memory areas etc..
+ */
+extern void *empty_zero_page;
+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
+
+/*
+ * No page table caches to initialise.
+ */
+#define pgtable_cache_init() do { } while (0)
+
+/*
+ * All 32bit addresses are effectively valid for vmalloc...
+ * Sort of meaningless for non-VM targets.
+ */
+#define VMALLOC_START 0
+#define VMALLOC_END 0xffffffff
+#define KMAP_START 0
+#define KMAP_END 0xffffffff
+
+#include <asm-generic/pgtable.h>
+
+#define check_pgt_cache() do { } while (0)
+
+#endif
@@ -17,8 +17,13 @@ struct lkl_jmp_buf {
* These operations must be provided by a host library or by the application
* itself.
*
+ * @mem_alloc - allocate memory
+ * @mem_free - free memory
+ *
*/
struct lkl_host_operations {
+ void *(*mem_alloc)(unsigned long mem);
+ void (*mem_free)(void *mem);
};
void lkl_bug(const char *fmt, ...);
new file mode 100644
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/memblock.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+
+unsigned long memory_start, memory_end;
+static unsigned long _memory_start, mem_size;
+
+void *empty_zero_page;
+
+void __init bootmem_init(unsigned long mem_sz)
+{
+ mem_size = mem_sz;
+
+ _memory_start = (unsigned long)lkl_ops->mem_alloc(mem_size);
+ memory_start = _memory_start;
+ WARN_ON(!memory_start);
+ memory_end = memory_start + mem_size;
+
+ if (PAGE_ALIGN(memory_start) != memory_start) {
+ mem_size -= PAGE_ALIGN(memory_start) - memory_start;
+ memory_start = PAGE_ALIGN(memory_start);
+ mem_size = (mem_size / PAGE_SIZE) * PAGE_SIZE;
+ }
+ pr_info("memblock address range: 0x%lx - 0x%lx\n", memory_start,
+ memory_start + mem_size);
+ /*
+ * Give all the memory to the bootmap allocator, tell it to put the
+ * boot mem_map at the start of memory.
+ */
+ max_low_pfn = virt_to_pfn(memory_end);
+ min_low_pfn = virt_to_pfn(memory_start);
+ memblock_add(memory_start, mem_size);
+
+ empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+ {
+ unsigned long zones_size[MAX_NR_ZONES] = {0, };
+
+ zones_size[ZONE_NORMAL] = (mem_size) >> PAGE_SHIFT;
+ free_area_init(zones_size);
+ }
+}
+
+void __init mem_init(void)
+{
+ max_mapnr = (((unsigned long)high_memory) - PAGE_OFFSET) >> PAGE_SHIFT;
+ /* this will put all memory onto the freelists */
+ totalram_pages_add(memblock_free_all());
+ pr_info("Memory available: %luk/%luk RAM\n",
+ (nr_free_pages() << PAGE_SHIFT) >> 10, mem_size >> 10);
+}
+
+/*
+ * In our case __init memory is not part of the page allocator so there is
+ * nothing to free.
+ */
+void free_initmem(void)
+{
+}
+
+void free_mem(void)
+{
+ lkl_ops->mem_free((void *)_memory_start);
+}