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author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2017-04-15 20:07:53 +0300 |
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committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2017-05-18 06:50:53 +0200 |
commit | e87564ffe7d0636699467b776a24adffb2f11cca (patch) | |
tree | b4c4aa66031cfd20f29714d044c67217a439aba2 /src/northbridge/amd/pi/ramtop.c | |
parent | 61be3603f4b9f353e605d7b7c8d0d9f3b90f5636 (diff) |
binaryPI: Fix UMA calculations
Vendorcode decides already in AMD_INIT_POST the exact location
of UMA memory. To meet alignment requirements, it will extend
uma_memory_size. We cannot calculate base from size and TOP_MEM1,
but need to calculate size from base and TOP_MEM1 instead.
Also allows selection of UmaMode==UMA_SPECIFIED to manually set
amount of memory reserved for framebuffer.
Change-Id: I0c375e5da0dfef6cef0c50272356cd32a87b1ff6
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/19346
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/northbridge/amd/pi/ramtop.c')
-rw-r--r-- | src/northbridge/amd/pi/ramtop.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/northbridge/amd/pi/ramtop.c b/src/northbridge/amd/pi/ramtop.c new file mode 100644 index 0000000000..2b501dcf05 --- /dev/null +++ b/src/northbridge/amd/pi/ramtop.c @@ -0,0 +1,33 @@ +/* + * This file is part of the coreboot project. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#define __SIMPLE_DEVICE__ + +#include <stdint.h> +#include <arch/io.h> +#include <cbmem.h> + +#define CBMEM_TOP_SCRATCHPAD 0x78 + +void backup_top_of_ram(uint64_t ramtop) +{ + uint16_t top_cache = ramtop >> 16; + pci_write_config16(PCI_DEV(0,0,0), CBMEM_TOP_SCRATCHPAD, top_cache); +} + +unsigned long get_top_of_ram(void) +{ + uint16_t top_cache; + top_cache = pci_read_config16(PCI_DEV(0,0,0), CBMEM_TOP_SCRATCHPAD); + return (top_cache << 16); +} |