diff options
| -rw-r--r-- | README.md | 37 | ||||
| -rw-r--r-- | sv/soc/bus/dmactl.sv | 8 | ||||
| -rw-r--r-- | sv/soc/irq/pimc.sv | 4 | ||||
| -rw-r--r-- | tb/soc/irq/tb_pimc.cpp | 4 |
4 files changed, 45 insertions, 8 deletions
@@ -25,8 +25,45 @@ Only accessed by the CPU for certain instructions. Cannot be directly read/writt | `rp` | 64 bits | Return pointer for branches | | `ins` | 64 bits | Current instruction at `pc` | +## Special Registers + +OSMX64 provides "special" control registers that may vary depending on the chip +revision. These registers typically include chip-specific mode/control bits to +configure the processor for certain modes of operations, etc. These registers +cannot be accessed via the "mov" instruction and instead rely on independent wrs/rrs +(i.e., special register write / special register read) instructions. + +### Common Special Registers + +| Name | Size | Purpose | +| --------- | ------- | --------------------------- | +| `SR_STATE`| 64 bits | Processor state bits | + + +### SR\_STATE + +| Bit | Meaning | Purpose +|------|---------------------- | ---------------------- | +| 0 | Reserved | Must be zero | +| 1 | Supervisor | Supervisor mode enable | +| 2-31 | Reserved (must be 0) | Must be zero | + + + ## Instructions + +### Special Register Access + +Special registers are identified with a 16-bit Special Register ID (SRID) +and can be accessed through two special instructions. + +| Mnemonic | Effect | +| -------------------------------- | ----------------------- | +| `wrs` srid: r/imm, val: r | `SREGS[srid]` = `val` | +| `rrs` dest: r, srid: r/imm | `dest` = `SREGS[srid]` | + + ### Bitwise Instructions Bitwise logic operations can write to all registers except `v0`-`v7`, `x0` and `pc`. Can read from all registers except `v0`-`v7`. diff --git a/sv/soc/bus/dmactl.sv b/sv/soc/bus/dmactl.sv index c0851c1..27a13ec 100644 --- a/sv/soc/bus/dmactl.sv +++ b/sv/soc/bus/dmactl.sv @@ -1,5 +1,5 @@ /* - * Copyright (c) 2024 Athena Systems LLC and Ian Marco Moffett + * Copyright (c) 2024-2025 Ian Marco Moffett and the Osmora Team. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -10,7 +10,7 @@ * 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 + * 3. Neither the name of Hyra nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * @@ -36,8 +36,8 @@ module dmactl #( /* MMIO bases for DMA channels */ parameter C0_MMIO_BASE = 48'h1000140, parameter C1_MMIO_BASE = 48'h1000153, - parameter C2_MMIO_BASE = 48'h1000153, - parameter C3_MMIO_BASE = 48'h1000166, + parameter C2_MMIO_BASE = 48'h1000166, + parameter C3_MMIO_BASE = 48'h100016E, /* Channel control bits */ parameter CCTL_START = 0, diff --git a/sv/soc/irq/pimc.sv b/sv/soc/irq/pimc.sv index 15b82c9..21d5dde 100644 --- a/sv/soc/irq/pimc.sv +++ b/sv/soc/irq/pimc.sv @@ -1,5 +1,5 @@ /* - * Copyright (c) 2024 Athena Systems LLC and Ian Marco Moffett + * Copyright (c) 2024-2025 Ian Marco Moffett and the Osmora Team. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -10,7 +10,7 @@ * 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 + * 3. Neither the name of Hyra nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * diff --git a/tb/soc/irq/tb_pimc.cpp b/tb/soc/irq/tb_pimc.cpp index ec06a5d..7365649 100644 --- a/tb/soc/irq/tb_pimc.cpp +++ b/tb/soc/irq/tb_pimc.cpp @@ -1,5 +1,5 @@ /* - * Copyright (c) 2024 Athena Systems LLC and Ian Marco Moffett + * Copyright (c) 2024-2025 Ian Marco Moffett and the Osmora Team. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -10,7 +10,7 @@ * 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 + * 3. Neither the name of Hyra nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * |