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RISCY BUSINESS»Episode Guide
Understanding the Relationship Between the PLIC, mie, and mstatus MIE Bit
References ▼
insideHPC
John Gustafson presents: Beyond Floating Point – Next Generation Computer Arithmetic
[1]0:18
RISC-V
Draft Privileged ISA Specification v1.9.1
[2]4:33
RISC-V
User-Level ISA Specification v2.1
[3]58:35
SiFive Developers
E3 Coreplex Manual
[4]59:28
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0:18Mention John Gustafson's talk on a new way of encoding decimal numbers1
0:18Mention John Gustafson's talk on a new way of encoding decimal numbers1
0:18Mention John Gustafson's talk on a new way of encoding decimal numbers1
3:16Set the stage for the day
3:16Set the stage for the day
3:16Set the stage for the day
4:33Read about mstatus2
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4:33Read about mstatus2
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4:33Read about mstatus2
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5:24miblo Haha! I noticed myself doing that and wanted to break the same habit! (Without success, I think)
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5:24miblo Haha! I noticed myself doing that and wanted to break the same habit! (Without success, I think)
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5:24miblo Haha! I noticed myself doing that and wanted to break the same habit! (Without success, I think)
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6:09Research the Machine Status Register
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6:09Research the Machine Status Register
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6:09Research the Machine Status Register
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8:32Consult demo_gpio.c and plic_driver.c and wonder what the machine-external and machine-timer interrupts bits are doing
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8:32Consult demo_gpio.c and plic_driver.c and wonder what the machine-external and machine-timer interrupts bits are doing
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8:32Consult demo_gpio.c and plic_driver.c and wonder what the machine-external and machine-timer interrupts bits are doing
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12:08Wonder also why we have a separate Coreplex-Local Interrupts controller
12:08Wonder also why we have a separate Coreplex-Local Interrupts controller
12:08Wonder also why we have a separate Coreplex-Local Interrupts controller
14:35Continue reading about the machine-mode status register (mstatus)
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14:35Continue reading about the machine-mode status register (mstatus)
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14:35Continue reading about the machine-mode status register (mstatus)
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20:27Summarise how the mie bit in the mstatus register is being used
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20:27Summarise how the mie bit in the mstatus register is being used
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20:27Summarise how the mie bit in the mstatus register is being used
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21:36Read about privilege levels
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21:36Read about privilege levels
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21:36Read about privilege levels
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24:32Determine that the PLIC only handles global interrupts, and read about local interrupt sources
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24:32Determine that the PLIC only handles global interrupts, and read about local interrupt sources
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24:32Determine that the PLIC only handles global interrupts, and read about local interrupt sources
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28:01Read about Interrupt Targets and Hart Contexts
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28:01Read about Interrupt Targets and Hart Contexts
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28:01Read about Interrupt Targets and Hart Contexts
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29:19Consult the PLIC diagram
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29:19Consult the PLIC diagram
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29:19Consult the PLIC diagram
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🖌
31:00Continue reading about the interrupts in terms of the mip
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31:00Continue reading about the interrupts in terms of the mip
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31:00Continue reading about the interrupts in terms of the mip
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39:47Note that PLIC_enable_interrupt() and PLIC_disable_interrupt() happen on a per-thread basis
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39:47Note that PLIC_enable_interrupt() and PLIC_disable_interrupt() happen on a per-thread basis
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39:47Note that PLIC_enable_interrupt() and PLIC_disable_interrupt() happen on a per-thread basis
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41:58Review the documentation on Machine Interrupt Registers (mip and mie)
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41:58Review the documentation on Machine Interrupt Registers (mip and mie)
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41:58Review the documentation on Machine Interrupt Registers (mip and mie)
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46:53Consult the table on mstatus and consider the difference between mip and mie
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46:53Consult the table on mstatus and consider the difference between mip and mie
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46:53Consult the table on mstatus and consider the difference between mip and mie
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49:01Return to demo_gpio.c, note that the clear_csr() calls in reset_demo() are not disabling software interrupts, and consider asking why
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49:01Return to demo_gpio.c, note that the clear_csr() calls in reset_demo() are not disabling software interrupts, and consider asking why
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49:01Return to demo_gpio.c, note that the clear_csr() calls in reset_demo() are not disabling software interrupts, and consider asking why
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53:44Skim over demo_gpio.c in general
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53:44Skim over demo_gpio.c in general
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53:44Skim over demo_gpio.c in general
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55:15tenbroya Heyo
🗪
55:15tenbroya Heyo
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55:15tenbroya Heyo
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55:57tenbroya (it's James from the HMN IRC)
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55:57tenbroya (it's James from the HMN IRC)
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55:57tenbroya (it's James from the HMN IRC)
🗪
56:04Continue skimming over demo_gpio.c
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56:04Continue skimming over demo_gpio.c
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56:04Continue skimming over demo_gpio.c
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58:35RISC-V Assembly Programmer's Handbook3
58:35RISC-V Assembly Programmer's Handbook3
58:35RISC-V Assembly Programmer's Handbook3
59:28Read about the Coreplex-Local Interrupts (CLINT)4
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59:28Read about the Coreplex-Local Interrupts (CLINT)4
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59:28Read about the Coreplex-Local Interrupts (CLINT)4
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1:02:44Read about MSIP Registers
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1:02:44Read about MSIP Registers
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1:02:44Read about MSIP Registers
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1:03:40That's all the time we have for today
1:03:40That's all the time we have for today
1:03:40That's all the time we have for today