OSDev.org

nexos wrote:Hello,
I know I want my OS to support ACPI. I personally think ACPI is a complicated standard, but something as widespread as the PC needs something complicated to control the system. I have started reading the ACPI spec, and know I have a question: How should I handle ACPI? To me, there are 3 options:
Use ACPICA. I would get the largest amount of features, the ability to have full ACPI support out of the box, and more. But it is big and bloated, and I want to understand all the code in my OS .
Use LAI. I would get all I really need, not quite full ACPI support, but enough. However, LAI uses different coding conventions then me, and that would create inconstancy. Plus I wouldn't get everything.
Write my own. The most complicated solution, but I would be able to control what things I have support for. I would right all the code, meaning I would understand how it works.
Currently, I am leaning towards writing my own as a learning experience.
What do you think is the best option?

PeterX wrote:I would probably go for writing my own and then notice it might be a bit more than I can handle

PeterX wrote:What coding conventions are different in/with LAI?

typedef struct tagACPI_RSDP
{
    BYTE sig[8];
    BYTE checksum;
    BYTE oemId[6];
    BYTE rev;
    DWORD rsdtAddr;
    DWORD len;
    QWORD xsdtAddr;
    BYTE extChecksum;
    BYTE resvd[3];
}__attribute__((packed)) ACPI_RSDP;

nexos wrote:

PeterX wrote:I would probably go for writing my own and then notice it might be a bit more than I can handle

ACPI does look like a beast, but I am in no rush to get my OS done .

nexos wrote:

PeterX wrote:What coding conventions are different in/with LAI?

Functions and structures use different styles, i.e. my structures look like

Code: Select all

typedef struct tagACPI_RSDP
{
    BYTE sig[8];
    BYTE checksum;
    BYTE oemId[6];
    BYTE rev;
    DWORD rsdtAddr;
    DWORD len;
    QWORD xsdtAddr;
    BYTE extChecksum;
    BYTE resvd[3];
}__attribute__((packed)) ACPI_RSDP;

While LAI uses Linux style names