On 10.01.2018 22:53, David Hildenbrand wrote:
> We now have the range of free memory, let's initialize the physical
> allocator. It is now possible to use alloc_page()/alloc_pages().
>
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
> lib/s390x/sclp.c | 13 +++++++++++++
> s390x/Makefile | 3 +++
> 2 files changed, 16 insertions(+)
>
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> index ee56820..c0492b8 100644
> --- a/lib/s390x/sclp.c
> +++ b/lib/s390x/sclp.c
> @@ -14,14 +14,23 @@
> #include <asm/page.h>
> #include <asm/arch_def.h>
> #include "sclp.h"
> +#include <alloc_phys.h>
> +
> +extern unsigned long stacktop;
>
> static char _sccb[PAGE_SIZE] __attribute__((__aligned__(4096)));
> static uint64_t storage_increment_size;
> static uint64_t max_ram_size;
> static uint64_t ram_size;
>
> +static void mem_init(phys_addr_t freemem_start, phys_addr_t mem_end)
> +{
> + phys_alloc_init(freemem_start, ram_size - freemem_start);
> +}
> +
> void sclp_memory_setup(void)
> {
> + phys_addr_t freemem_start;
> ReadInfo *ri = (void *)_sccb;
> uint64_t rnmax, rnsize;
>
> @@ -49,4 +58,8 @@ void sclp_memory_setup(void)
> while (ram_size < max_ram_size &&
> tprot(ram_size + storage_increment_size - 1))
> ram_size += storage_increment_size;
> +
> + /* leave another extra page free */
> + freemem_start = ((phys_addr_t)&stacktop + PAGE_SIZE) & PAGE_MASK;
<bikeshedpainting>
I think I'd rather move that above line into mem_init() instead...
</bikeshedpainting>
Thomas
