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/*
* Copyright (c) 2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef GPT_RME_PRIVATE_H
#define GPT_RME_PRIVATE_H
#include <arch.h>
#include <lib/gpt_rme/gpt_rme.h>
#include <lib/utils_def.h>
/******************************************************************************/
/* GPT descriptor definitions */
/******************************************************************************/
/* GPT level 0 descriptor bit definitions. */
#define GPT_L0_TYPE_MASK UL(0xF)
#define GPT_L0_TYPE_SHIFT U(0)
/* For now, we don't support contiguous descriptors, only table and block. */
#define GPT_L0_TYPE_TBL_DESC UL(0x3)
#define GPT_L0_TYPE_BLK_DESC UL(0x1)
#define GPT_L0_TBL_DESC_L1ADDR_MASK UL(0xFFFFFFFFFF)
#define GPT_L0_TBL_DESC_L1ADDR_SHIFT U(12)
#define GPT_L0_BLK_DESC_GPI_MASK UL(0xF)
#define GPT_L0_BLK_DESC_GPI_SHIFT U(4)
/* GPT level 1 descriptor bit definitions */
#define GPT_L1_GRAN_DESC_GPI_MASK UL(0xF)
/*
* This macro fills out every GPI entry in a granules descriptor to the same
* value.
*/
#define GPT_BUILD_L1_DESC(_gpi) (((uint64_t)(_gpi) << 4*0) | \
((uint64_t)(_gpi) << 4*1) | \
((uint64_t)(_gpi) << 4*2) | \
((uint64_t)(_gpi) << 4*3) | \
((uint64_t)(_gpi) << 4*4) | \
((uint64_t)(_gpi) << 4*5) | \
((uint64_t)(_gpi) << 4*6) | \
((uint64_t)(_gpi) << 4*7) | \
((uint64_t)(_gpi) << 4*8) | \
((uint64_t)(_gpi) << 4*9) | \
((uint64_t)(_gpi) << 4*10) | \
((uint64_t)(_gpi) << 4*11) | \
((uint64_t)(_gpi) << 4*12) | \
((uint64_t)(_gpi) << 4*13) | \
((uint64_t)(_gpi) << 4*14) | \
((uint64_t)(_gpi) << 4*15))
/******************************************************************************/
/* GPT platform configuration */
/******************************************************************************/
/* This value comes from GPCCR_EL3 so no externally supplied definition. */
#define GPT_L0GPTSZ ((unsigned int)((read_gpccr_el3() >> \
GPCCR_L0GPTSZ_SHIFT) & GPCCR_L0GPTSZ_MASK))
/* The "S" value is directly related to L0GPTSZ */
#define GPT_S_VAL (GPT_L0GPTSZ + 30U)
/*
* Map PPS values to T values.
*
* PPS Size T
* 0b000 4GB 32
* 0b001 64GB 36
* 0b010 1TB 40
* 0b011 4TB 42
* 0b100 16TB 44
* 0b101 256TB 48
* 0b110 4PB 52
*
* See section 15.1.27 of the RME specification.
*/
typedef enum {
PPS_4GB_T = 32U,
PPS_64GB_T = 36U,
PPS_1TB_T = 40U,
PPS_4TB_T = 42U,
PPS_16TB_T = 44U,
PPS_256TB_T = 48U,
PPS_4PB_T = 52U
} gpt_t_val_e;
/*
* Map PGS values to P values.
*
* PGS Size P
* 0b00 4KB 12
* 0b10 16KB 14
* 0b01 64KB 16
*
* Note that pgs=0b10 is 16KB and pgs=0b01 is 64KB, this is not a typo.
*
* See section 15.1.27 of the RME specification.
*/
typedef enum {
PGS_4KB_P = 12U,
PGS_16KB_P = 14U,
PGS_64KB_P = 16U
} gpt_p_val_e;
/* Max valid value for PGS. */
#define GPT_PGS_MAX (2U)
/* Max valid value for PPS. */
#define GPT_PPS_MAX (6U)
/******************************************************************************/
/* L0 address attribute macros */
/******************************************************************************/
/*
* Width of the L0 index field.
*
* If S is greater than or equal to T then there is a single L0 region covering
* the entire protected space so there is no L0 index, so the width (and the
* derivative mask value) are both zero. If we don't specifically handle this
* special case we'll get a negative width value which does not make sense and
* would cause problems.
*/
#define GPT_L0_IDX_WIDTH(_t) (((_t) > GPT_S_VAL) ? \
((_t) - GPT_S_VAL) : (0U))
/* Bit shift for the L0 index field in a PA. */
#define GPT_L0_IDX_SHIFT (GPT_S_VAL)
/*
* Mask for the L0 index field, must be shifted.
*
* The value 0x3FFFFF is 22 bits wide which is the maximum possible width of the
* L0 index within a physical address. This is calculated by
* ((t_max - 1) - s_min + 1) where t_max is 52 for 4PB, the largest PPS, and
* s_min is 30 for 1GB, the smallest L0GPTSZ.
*/
#define GPT_L0_IDX_MASK(_t) (0x3FFFFFUL >> (22U - \
(GPT_L0_IDX_WIDTH(_t))))
/* Total number of L0 regions. */
#define GPT_L0_REGION_COUNT(_t) ((GPT_L0_IDX_MASK(_t)) + 1U)
/* Total size of each GPT L0 region in bytes. */
#define GPT_L0_REGION_SIZE (1UL << (GPT_L0_IDX_SHIFT))
/* Total size in bytes of the whole L0 table. */
#define GPT_L0_TABLE_SIZE(_t) ((GPT_L0_REGION_COUNT(_t)) << 3U)
/******************************************************************************/
/* L1 address attribute macros */
/******************************************************************************/
/*
* Width of the L1 index field.
*
* This field does not have a special case to handle widths less than zero like
* the L0 index field above since all valid combinations of PGS (p) and L0GPTSZ
* (s) will result in a positive width value.
*/
#define GPT_L1_IDX_WIDTH(_p) ((GPT_S_VAL - 1U) - ((_p) + 3U))
/* Bit shift for the L1 index field. */
#define GPT_L1_IDX_SHIFT(_p) ((_p) + 4U)
/*
* Mask for the L1 index field, must be shifted.
*
* The value 0x7FFFFF is 23 bits wide and is the maximum possible width of the
* L1 index within a physical address. It is calculated by
* ((s_max - 1) - (p_min + 4) + 1) where s_max is 39 for 512gb, the largest
* L0GPTSZ, and p_min is 12 for 4KB granules, the smallest PGS.
*/
#define GPT_L1_IDX_MASK(_p) (0x7FFFFFUL >> (23U - \
(GPT_L1_IDX_WIDTH(_p))))
/* Bit shift for the index of the L1 GPI in a PA. */
#define GPT_L1_GPI_IDX_SHIFT(_p) (_p)
/* Mask for the index of the L1 GPI in a PA. */
#define GPT_L1_GPI_IDX_MASK (0xF)
/* Total number of entries in each L1 table. */
#define GPT_L1_ENTRY_COUNT(_p) ((GPT_L1_IDX_MASK(_p)) + 1U)
/* Total size in bytes of each L1 table. */
#define GPT_L1_TABLE_SIZE(_p) ((GPT_L1_ENTRY_COUNT(_p)) << 3U)
/******************************************************************************/
/* General helper macros */
/******************************************************************************/
/* Protected space actual size in bytes. */
#define GPT_PPS_ACTUAL_SIZE(_t) (1UL << (_t))
/* Granule actual size in bytes. */
#define GPT_PGS_ACTUAL_SIZE(_p) (1UL << (_p))
/* L0 GPT region size in bytes. */
#define GPT_L0GPTSZ_ACTUAL_SIZE (1UL << GPT_S_VAL)
/* Get the index of the L0 entry from a physical address. */
#define GPT_L0_IDX(_pa) ((_pa) >> GPT_L0_IDX_SHIFT)
/*
* This definition is used to determine if a physical address lies on an L0
* region boundary.
*/
#define GPT_IS_L0_ALIGNED(_pa) (((_pa) & (GPT_L0_REGION_SIZE - U(1))) == U(0))
/* Get the type field from an L0 descriptor. */
#define GPT_L0_TYPE(_desc) (((_desc) >> GPT_L0_TYPE_SHIFT) & \
GPT_L0_TYPE_MASK)
/* Create an L0 block descriptor. */
#define GPT_L0_BLK_DESC(_gpi) (GPT_L0_TYPE_BLK_DESC | \
(((_gpi) & GPT_L0_BLK_DESC_GPI_MASK) << \
GPT_L0_BLK_DESC_GPI_SHIFT))
/* Create an L0 table descriptor with an L1 table address. */
#define GPT_L0_TBL_DESC(_pa) (GPT_L0_TYPE_TBL_DESC | ((uint64_t)(_pa) & \
(GPT_L0_TBL_DESC_L1ADDR_MASK << \
GPT_L0_TBL_DESC_L1ADDR_SHIFT)))
/* Get the GPI from an L0 block descriptor. */
#define GPT_L0_BLKD_GPI(_desc) (((_desc) >> GPT_L0_BLK_DESC_GPI_SHIFT) & \
GPT_L0_BLK_DESC_GPI_MASK)
/* Get the L1 address from an L0 table descriptor. */
#define GPT_L0_TBLD_ADDR(_desc) ((uint64_t *)(((_desc) & \
(GPT_L0_TBL_DESC_L1ADDR_MASK << \
GPT_L0_TBL_DESC_L1ADDR_SHIFT))))
/* Get the index into the L1 table from a physical address. */
#define GPT_L1_IDX(_p, _pa) (((_pa) >> GPT_L1_IDX_SHIFT(_p)) & \
GPT_L1_IDX_MASK(_p))
/* Get the index of the GPI within an L1 table entry from a physical address. */
#define GPT_L1_GPI_IDX(_p, _pa) (((_pa) >> GPT_L1_GPI_IDX_SHIFT(_p)) & \
GPT_L1_GPI_IDX_MASK)
/* Determine if an address is granule-aligned. */
#define GPT_IS_L1_ALIGNED(_p, _pa) (((_pa) & (GPT_PGS_ACTUAL_SIZE(_p) - U(1))) \
== U(0))
#endif /* GPT_RME_PRIVATE_H */
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